Update grpc-core, grpc-interop-testing, ... to 1.69.0 #1062

Job	Run time
Docs	3m 1s
Docs	3m 1s
Compile Benchmarks	1m 55s
Compile Benchmarks	1m 55s
Checks	2m 22s
Checks	2m 22s
Compile and test (2.12.20, 8)	3m 55s
Compile and test (2.12.20, 8)	3m 55s
Gradle tests	3m 52s
Gradle tests	3m 52s
Compile and test (2.12.20, 11)	4m 16s
Compile and test (2.12.20, 11)	4m 16s
Maven tests	3m 20s
Maven tests	3m 20s
Compile and test (2.12.20, 17)	4m 6s
Compile and test (2.12.20, 17)	4m 6s
sbt scripted tests (gen-scala-server, 2.12)	7m 54s
sbt scripted tests (gen-scala-server, 2.12)	7m 54s
Compile and test (2.12.20, 21)	3m 39s
Compile and test (2.12.20, 21)	3m 32s
sbt scripted tests (gen-java, 2.12)	4m 5s
sbt scripted tests (gen-java, 2.12)	4m 5s
Compile and test (2.13.15, 8)	4m 36s
Compile and test (2.13.15, 8)	4m 36s
Compile and test (2.13.15, 11)	4m 15s
Compile and test (2.13.15, 11)	4m 15s
Compile and test (2.13.15, 17)	4m 40s
Compile and test (2.13.15, 17)	4m 40s
Compile and test (2.13.15, 21)	4m 8s
Compile and test (2.13.15, 21)	4m 8s
Compile and test (3.3.4, 8)	4m 40s
Compile and test (3.3.4, 8)	4m 40s
Compile and test (3.3.4, 11)	4m 28s
Compile and test (3.3.4, 11)	4m 28s
Compile and test (3.3.4, 17)	4m 24s
Compile and test (3.3.4, 17)	4m 24s
Compile and test (3.3.4, 21)	3m 54s
Compile and test (3.3.4, 21)	3m 54s
	2h 34m 53s

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