fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEPROTOBUF-8055227
- https://snyk.io/vuln/SNYK-JAVA-ORGJETBRAINSKOTLIN-2393744

pom.xml

@@ -61,7 +61,7 @@
         <mongodb.version>4.11.3</mongodb.version>
         <mordant.version>3.0.0</mordant.version>
         <problem.version>0.27.1</problem.version>
-        <protobuf.version>4.28.0</protobuf.version>
+        <protobuf.version>4.28.2</protobuf.version>
         <slf4j.version>2.0.13</slf4j.version>
         <swagger-annotations.version>1.6.6</swagger-annotations.version>
         <titanium-json-ld.version>1.4.1</titanium-json-ld.version>