Support Rust edition 2024 (#8638)

* Developers intro how to contribute

* Fix Rust code generation for Rust edition 2024

The errors look like:

```
warning[E0133]: call to unsafe function `fbs::flatbuffers::emplace_scalar` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::follow_cast_ref` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::Follow::follow` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::read_scalar_at` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::root_unchecked` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::size_prefixed_root_unchecked` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `fbs::flatbuffers::Table::<'a>::new` is unsafe and requires unsafe block
warning[E0133]: call to unsafe function `std::slice::from_raw_parts` is unsafe and requires unsafe block
```

* Update goldens

Ran `goldens/generate_goldens.py`

* Regenerate code files

Ran `scripts/generate_code.py`

tests/namespace_test/namespace_a/namespace_b/enum_in_nested_ns_generated.rs

@@ -60,7 +60,7 @@ impl<'a> flatbuffers::Follow<'a> for EnumInNestedNS {
   type Inner = Self;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    let b = flatbuffers::read_scalar_at::<i8>(buf, loc);
+    let b = unsafe { flatbuffers::read_scalar_at::<i8>(buf, loc) };
     Self(b)
   }
 }
@@ -69,7 +69,7 @@ impl flatbuffers::Push for EnumInNestedNS {
     type Output = EnumInNestedNS;
     #[inline]
     unsafe fn push(&self, dst: &mut [u8], _written_len: usize) {
-        flatbuffers::emplace_scalar::<i8>(dst, self.0);
+        unsafe { flatbuffers::emplace_scalar::<i8>(dst, self.0); }
     }
 }
 

tests/namespace_test/namespace_a/namespace_b/struct_in_nested_ns_generated.rs

@@ -32,21 +32,21 @@ impl<'a> flatbuffers::Follow<'a> for StructInNestedNS {
   type Inner = &'a StructInNestedNS;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    <&'a StructInNestedNS>::follow(buf, loc)
+    unsafe { <&'a StructInNestedNS>::follow(buf, loc) }
   }
 }
 impl<'a> flatbuffers::Follow<'a> for &'a StructInNestedNS {
   type Inner = &'a StructInNestedNS;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    flatbuffers::follow_cast_ref::<StructInNestedNS>(buf, loc)
+    unsafe { flatbuffers::follow_cast_ref::<StructInNestedNS>(buf, loc) }
   }
 }
 impl<'b> flatbuffers::Push for StructInNestedNS {
     type Output = StructInNestedNS;
     #[inline]
     unsafe fn push(&self, dst: &mut [u8], _written_len: usize) {
-        let src = ::core::slice::from_raw_parts(self as *const StructInNestedNS as *const u8, <Self as flatbuffers::Push>::size());
+        let src = unsafe { ::core::slice::from_raw_parts(self as *const StructInNestedNS as *const u8, <Self as flatbuffers::Push>::size()) };
         dst.copy_from_slice(src);
     }
     #[inline]

tests/namespace_test/namespace_a/namespace_b/table_in_nested_ns_generated.rs

@@ -20,7 +20,7 @@ impl<'a> flatbuffers::Follow<'a> for TableInNestedNS<'a> {
   type Inner = TableInNestedNS<'a>;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    Self { _tab: flatbuffers::Table::new(buf, loc) }
+    Self { _tab: unsafe { flatbuffers::Table::new(buf, loc) } }
   }
 }
 

tests/namespace_test/namespace_a/namespace_b/union_in_nested_ns_generated.rs

@@ -56,7 +56,7 @@ impl<'a> flatbuffers::Follow<'a> for UnionInNestedNS {
   type Inner = Self;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    let b = flatbuffers::read_scalar_at::<u8>(buf, loc);
+    let b = unsafe { flatbuffers::read_scalar_at::<u8>(buf, loc) };
     Self(b)
   }
 }
@@ -65,7 +65,7 @@ impl flatbuffers::Push for UnionInNestedNS {
     type Output = UnionInNestedNS;
     #[inline]
     unsafe fn push(&self, dst: &mut [u8], _written_len: usize) {
-        flatbuffers::emplace_scalar::<u8>(dst, self.0);
+        unsafe { flatbuffers::emplace_scalar::<u8>(dst, self.0); }
     }
 }
 

tests/namespace_test/namespace_a/second_table_in_a_generated.rs

@@ -20,7 +20,7 @@ impl<'a> flatbuffers::Follow<'a> for SecondTableInA<'a> {
   type Inner = SecondTableInA<'a>;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    Self { _tab: flatbuffers::Table::new(buf, loc) }
+    Self { _tab: unsafe { flatbuffers::Table::new(buf, loc) } }
   }
 }
 

tests/namespace_test/namespace_a/table_in_first_ns_generated.rs

@@ -20,7 +20,7 @@ impl<'a> flatbuffers::Follow<'a> for TableInFirstNS<'a> {
   type Inner = TableInFirstNS<'a>;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    Self { _tab: flatbuffers::Table::new(buf, loc) }
+    Self { _tab: unsafe { flatbuffers::Table::new(buf, loc) } }
   }
 }
 

tests/namespace_test/namespace_c/table_in_c_generated.rs

@@ -20,7 +20,7 @@ impl<'a> flatbuffers::Follow<'a> for TableInC<'a> {
   type Inner = TableInC<'a>;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    Self { _tab: flatbuffers::Table::new(buf, loc) }
+    Self { _tab: unsafe { flatbuffers::Table::new(buf, loc) } }
   }
 }