Update protobuf to 4.x to align with Spring

[salaboy]

Expected Behavior

Spring Boot and common dependencies are aligned with the version of protobuf-java that we are using. If there are no breaking changes we should upgrade to version 4.x.. as we are currently in 3.x.

Actual Behavior

We are using a very old version of protobuf java. New stacks like the observability stack that uses grpc to stream metrics and logs to other services are already using 4.x

Steps to Reproduce the Problem

Release Note

RELEASE NOTE:

[siri-varma]

/assign

[salaboy]

@siri-varma ok.. I can see thsi was my research on the matter, but can you make sure that we don't over upgrade?
there is no point in jumping to latest if Spring/ Spring Boot is not using the latest one.