Bump the dependencies group with 3 updates

Bumps the dependencies group with 3 updates: [com.google.errorprone:error_prone_annotations](https://github.com/google/error-prone), [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf) and [org.apache.maven.plugins:maven-gpg-plugin](https://github.com/apache/maven-gpg-plugin).


Updates `com.google.errorprone:error_prone_annotations` from 2.31.0 to 2.32.0
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](google/error-prone@v2.31.0...v2.32.0)

Updates `com.google.protobuf:protobuf-java` from 4.28.0 to 4.28.1
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

Updates `org.apache.maven.plugins:maven-gpg-plugin` from 3.2.5 to 3.2.6
- [Release notes](https://github.com/apache/maven-gpg-plugin/releases)
- [Commits](apache/maven-gpg-plugin@maven-gpg-plugin-3.2.5...maven-gpg-plugin-3.2.6)

---
updated-dependencies:
- dependency-name: com.google.errorprone:error_prone_annotations
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: org.apache.maven.plugins:maven-gpg-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -30,7 +30,7 @@
     -->
     <guava.jre.version>33.3.0-jre</guava.jre.version>
     <gwt.version>2.10.0</gwt.version>
-    <protobuf.version>4.28.0</protobuf.version>
+    <protobuf.version>4.28.1</protobuf.version>
     <!-- Property for protobuf-lite protocArtifact, which isn't a "normal" Maven dep. -->
     <!-- TODO(cpovirk): Use protobuf.version instead. But that requires finding the new way to request the Lite runtime. -->
     <protobuf-lite.protoc.version>3.1.0</protobuf-lite.protoc.version>
@@ -103,7 +103,7 @@
       <dependency>
         <groupId>com.google.errorprone</groupId>
         <artifactId>error_prone_annotations</artifactId>
-        <version>2.31.0</version>
+        <version>2.32.0</version>
       </dependency>
       <dependency>
         <groupId>com.google.protobuf</groupId>
@@ -296,7 +296,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-gpg-plugin</artifactId>
-          <version>3.2.5</version>
+          <version>3.2.6</version>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>