bump: proto-google-common-protos 2.50.0 (was 2.49.0) #1529

Job	Run time
Gradle tests	13m 38s
Compile Benchmarks	2m 36s
Checks	7m 25s
Compile and test (2.13)	5m 4s
Compile and test (3.3)	8m 16s
Maven tests	12m 19s
sbt scripted tests (gen-scala-server, 2.13)	8m 25s
sbt scripted tests (gen-java, 2.13)	9m 21s
sbt scripted tests (scala-2_13, 2.13)	5m 48s
sbt scripted tests (scala3, 3.3)	6m 16s
	1h 19m 8s

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