Update dependency com.google.protobuf:protobuf-bom to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.protobuf:protobuf-bom (source)	3.25.3 -> 4.26.1

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[breedx-splk]

I fiddled around with this for a while and couldn't get it working. It looks like the base class of generated messages changes (source?) and it seems like the toByteArray() (at least on grpc Status class) goes away.

[jack-berg]

It looks like the base class of generated messages changes (grpc/grpc-java#11015) and it seems like the toByteArray() (at least on grpc Status class) goes away.

The base class for messages changed from GeneratedMessageV3 to GeneratedMessage. The Status class comes from com.google.api.grpc:proto-google-common-protos, which hasn't upgraded to protobuf-bom v4 yet, and so there is a transitive dependency conflict which leads to the missing toByteArray method. We'll need to wait for com.google.api.grpc:proto-google-common-protos to upgrade, or maybe generate the classes ourselves if we're impatient, before upgrading.

Luckily, com.google.protobuf:protobuf-bom is only used in tests.