deps: Update dependency com.google.errorprone:error_prone_annotations to v2.21.1 (#110)

Author: renovate-bot

alloydb-jdbc-connector/pom.xml

@@ -108,7 +108,7 @@
  <dependency>
  <groupId>com.google.errorprone</groupId>
  <artifactId>error_prone_annotations</artifactId>
- <version>2.18.0</version>
+ <version>2.21.1</version>
  </dependency>
 
  <dependency>