Include a conformance test for timestamps without colon in time zone.

PiperOrigin-RevId: 758822948

Author: protobuf-github-bot

conformance/binary_json_conformance_suite.cc

@@ -3258,6 +3258,9 @@ void BinaryAndJsonConformanceSuiteImpl<
                             R"({"optionalTimestamp": "0001-01-01T00:00:00z"})");
   ExpectParseFailureForJson("TimestampJsonInputLowercaseT", REQUIRED,
                             R"({"optionalTimestamp": "0001-01-01t00:00:00Z"})");
+  ExpectParseFailureForJson(
+      "TimestampWithMissingColonInOffset", REQUIRED,
+      R"({"optionalTimestamp": "1970-01-01T08:00:01+0800"})");
   ExpectSerializeFailureForJson("TimestampProtoInputTooSmall", REQUIRED,
                                 "optional_timestamp: {seconds: -62135596801}");
   ExpectSerializeFailureForJson("TimestampProtoInputTooLarge", REQUIRED,

conformance/failure_list_php.txt

@@ -32,3 +32,4 @@ Required.*.ProtobufInput.ValidDataRepeated.FLOAT.UnpackedInput.JsonOutput
 Required.*.ProtobufInput.ValidDataScalar.FLOAT[2].JsonOutput
 Required.*.JsonInput.Int32FieldQuotedExponentialValue.*     # Failed to parse input or produce output.
 Required.*.JsonInput.AnyWithNoType.*
+Required.*.JsonInput.TimestampWithMissingColonInOffset # Should have failed to parse, but didn't.