Bump protobuf.version from 3.19.6 to 4.27.3

Bumps `protobuf.version` from 3.19.6 to 4.27.3.

Updates `com.google.protobuf:protobuf-java` from 3.19.6 to 4.27.3
- [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 `com.google.protobuf:protobuf-java-util` from 3.19.6 to 4.27.3

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: com.google.protobuf:protobuf-java-util
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

examples/serdes-with-references/pom.xml

@@ -11,7 +11,7 @@
   <artifactId>apicurio-registry-examples-references</artifactId>
 
   <properties>
-    <protobuf.version>4.26.1</protobuf.version>
+    <protobuf.version>4.27.3</protobuf.version>
     <proto-plugin.version>0.6.1</proto-plugin.version>
     <protobuf.googleapi.types.version>2.42.0</protobuf.googleapi.types.version>
   </properties>

pom.xml

@@ -147,7 +147,7 @@
     <okio.version>3.9.0</okio.version>
     <okio-fake-file-system.version>3.9.0</okio-fake-file-system.version>
     <icu4j.version>75.1</icu4j.version>
-    <protobuf.version>3.19.6</protobuf.version>
+    <protobuf.version>4.27.3</protobuf.version>
     <xmlsec.version>4.0.2</xmlsec.version>
     <protobuf.googleapi.types.version>2.42.0</protobuf.googleapi.types.version>
     <wsdl4j.version>1.6.3</wsdl4j.version>