Merge pull request #830 from confluentinc/protobuf-31.1

Upgrade protobuf to 31.1 to match ce-kafka

Author: rayokota

pom.xml

@@ -99,7 +99,7 @@
         <hamcrest.version>1.3</hamcrest.version>
         <!-- okio version to match ce-kafka 7.8.x -->
         <okio.version>3.7.0</okio.version>
-        <protobuf.version>4.29.3</protobuf.version>
+        <protobuf.version>4.31.1</protobuf.version>
         <powermock.version>2.0.9</powermock.version>
         <!-- Potentially used by downstream projects -->
         <slf4j-api.version>${slf4j.version}</slf4j-api.version>