Remove erroneous dependencies @com_google_googletest//:gtest and @com_google_googletest//:gtest_main from //src/google/protobuf/json:parser (#12267)

Downstream bazel projects that depend on protoc would need to provide googletest dependencies when it should not be necessary to do so.

Fixes #11409

Closes #12267

COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/12267 from prestonvanloon:remove-erroneous-googletest-dep 09fd163094
PiperOrigin-RevId: 517974450

src/google/protobuf/json/BUILD.bazel

@@ -227,8 +227,6 @@ cc_library(
         "@com_google_absl//absl/strings:str_format",
         "@com_google_absl//absl/types:optional",
         "@com_google_absl//absl/types:span",
-        "@com_google_googletest//:gtest",
-        "@com_google_googletest//:gtest_main",
     ],
 )