deps: update dependency com.google.api.grpc:proto-google-cloud-os-config-v1 to v2.5.6

Author: renovate-bot

pom.xml

@@ -134,7 +134,7 @@
  <dependency>
  <groupId>com.google.api.grpc</groupId>
  <artifactId>proto-google-cloud-os-config-v1</artifactId>
- <version>2.5.4</version>
+ <version>2.5.6</version>
  </dependency>
  <dependency>
  <groupId>io.perfmark</groupId>