fix(deps): update protocversion to v4 (major)

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.protobuf:protoc (source)	3.25.3 -> 4.26.0
com.google.protobuf:protobuf-java (source)	3.25.3 -> 4.26.0

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[NimJay]

The error from the deployment test seems related to the major bump from this pull-request:

deployment/adservice: container server terminated with exit code 1 ...
adservice ... Could not create logging file: Read-only file system
adservice ... COULD NOT CREATE A LOGGINGFILE 20240325-130457.1!Could not create logging file: Read-only file system

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