Fix bazel build (#5174)

rules_go was out of date.  Update that.  Also, a dependency
monster_extra_cc_fbs snuck in.  So, let's add that.

Fixes: #5163

BUILD

@@ -133,7 +133,6 @@ cc_test(
         "src/idl_parser.cpp",
         "src/reflection.cpp",
         "src/util.cpp",
-        "monster_test_generated.h",
         "tests/namespace_test/namespace_test1_generated.h",
         "tests/namespace_test/namespace_test2_generated.h",
         "tests/test.cpp",
@@ -162,6 +161,10 @@ cc_test(
         ":tests/union_vector/union_vector.fbs",
     ],
     includes = ["include/"],
+    deps = [
+        ":monster_extra_cc_fbs",
+        ":monster_test_cc_fbs",
+    ],
 )
 
 # Test bzl rules
@@ -175,3 +178,8 @@ flatbuffer_cc_library(
         "tests/include_test/sub/include_test2.fbs",
     ],
 )
+
+flatbuffer_cc_library(
+    name = "monster_extra_cc_fbs",
+    srcs = ["tests/monster_extra.fbs"],
+)