upgrade protobuf-java.version to 3.21.7 (#716)

Co-authored-by: Haotian Zhang <928016560@qq.com>

CHANGELOG.md

@@ -7,4 +7,5 @@
 - [docs:update PR template.](https://github.com/Tencent/spring-cloud-tencent/pull/691)
 - [Code optimize & add junit tests.](https://github.com/Tencent/spring-cloud-tencent/pull/703)
 - [Test:support environment variable metadata test](https://github.com/Tencent/spring-cloud-tencent/pull/710)
+- [upgrade protobuf-java.version to 3.21.7](https://github.com/Tencent/spring-cloud-tencent/pull/716)
 - [docs:update README.](https://github.com/Tencent/spring-cloud-tencent/pull/719)

spring-cloud-tencent-dependencies/pom.xml

@@ -78,7 +78,7 @@
 		<mocktio.version>4.5.1</mocktio.version>
 		<byte-buddy.version>1.12.10</byte-buddy.version>
 		<jackson.version>2.12.7</jackson.version>
-		<protobuf-java.version>3.16.1</protobuf-java.version>
+		<protobuf-java.version>3.21.7</protobuf-java.version>
 		<bcprov-jdk15on.version>1.69</bcprov-jdk15on.version>
 		<guava.version>31.0.1-jre</guava.version>
 		<system-stubs-junit4.version>2.0.1</system-stubs-junit4.version>