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`

samples/rust_generated/my_game/sample/color_generated.rs

@@ -60,7 +60,7 @@ impl<'a> flatbuffers::Follow<'a> for Color {
   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 Color {
     type Output = Color;
     #[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); }
     }
 }
 

samples/rust_generated/my_game/sample/equipment_generated.rs

@@ -56,7 +56,7 @@ impl<'a> flatbuffers::Follow<'a> for Equipment {
   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 Equipment {
     type Output = Equipment;
     #[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); }
     }
 }
 

samples/rust_generated/my_game/sample/monster_generated.rs

@@ -20,7 +20,7 @@ impl<'a> flatbuffers::Follow<'a> for Monster<'a> {
   type Inner = Monster<'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) } }
   }
 }
 
@@ -451,14 +451,14 @@ pub fn size_prefixed_root_as_monster_with_opts<'b, 'o>(
 /// # Safety
 /// Callers must trust the given bytes do indeed contain a valid `Monster`.
 pub unsafe fn root_as_monster_unchecked(buf: &[u8]) -> Monster {
-  flatbuffers::root_unchecked::<Monster>(buf)
+  unsafe { flatbuffers::root_unchecked::<Monster>(buf) }
 }
 #[inline]
 /// Assumes, without verification, that a buffer of bytes contains a size prefixed Monster and returns it.
 /// # Safety
 /// Callers must trust the given bytes do indeed contain a valid size prefixed `Monster`.
 pub unsafe fn size_prefixed_root_as_monster_unchecked(buf: &[u8]) -> Monster {
-  flatbuffers::size_prefixed_root_unchecked::<Monster>(buf)
+  unsafe { flatbuffers::size_prefixed_root_unchecked::<Monster>(buf) }
 }
 #[inline]
 pub fn finish_monster_buffer<'a, 'b, A: flatbuffers::Allocator + 'a>(

samples/rust_generated/my_game/sample/vec_3_generated.rs

@@ -33,21 +33,21 @@ impl<'a> flatbuffers::Follow<'a> for Vec3 {
   type Inner = &'a Vec3;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    <&'a Vec3>::follow(buf, loc)
+    unsafe { <&'a Vec3>::follow(buf, loc) }
   }
 }
 impl<'a> flatbuffers::Follow<'a> for &'a Vec3 {
   type Inner = &'a Vec3;
   #[inline]
   unsafe fn follow(buf: &'a [u8], loc: usize) -> Self::Inner {
-    flatbuffers::follow_cast_ref::<Vec3>(buf, loc)
+    unsafe { flatbuffers::follow_cast_ref::<Vec3>(buf, loc) }
   }
 }
 impl<'b> flatbuffers::Push for Vec3 {
     type Output = Vec3;
     #[inline]
     unsafe fn push(&self, dst: &mut [u8], _written_len: usize) {
-        let src = ::core::slice::from_raw_parts(self as *const Vec3 as *const u8, <Self as flatbuffers::Push>::size());
+        let src = unsafe { ::core::slice::from_raw_parts(self as *const Vec3 as *const u8, <Self as flatbuffers::Push>::size()) };
         dst.copy_from_slice(src);
     }
     #[inline]

samples/rust_generated/my_game/sample/weapon_generated.rs

@@ -20,7 +20,7 @@ impl<'a> flatbuffers::Follow<'a> for Weapon<'a> {
   type Inner = Weapon<'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) } }
   }
 }