deps: update protobuf-java.vesion to v3.21.7 (#137)

Author: renovate-bot

pom.xml

@@ -27,7 +27,7 @@
  <pubsub.version>1.120.18</pubsub.version>
  <pubsublite.version>1.7.0</pubsublite.version>
  <cloud-compute.version>1.12.1</cloud-compute.version>
- <protobuf-java.vesion>3.21.6</protobuf-java.vesion>
+ <protobuf-java.vesion>3.21.7</protobuf-java.vesion>
  <gax.version>2.19.1</gax.version>
  <slf4j.version>2.0.3</slf4j.version>
  </properties>