Update grpc-core, grpc-interop-testing, ... to 1.70.0 #1090

Job	Run time
Docs	3m 3s
Docs	3m 3s
Checks	2m 1s
Checks	2m 1s
Compile and test (2.12.20, 8)	4m 28s
Compile and test (2.12.20, 8)	4m 28s
Compile Benchmarks	1m 43s
Compile Benchmarks	1m 43s
Compile and test (2.12.20, 11)	4m 6s
Compile and test (2.12.20, 11)	4m 6s
Compile and test (2.12.20, 17)	4m 18s
Compile and test (2.12.20, 17)	4m 18s
Maven tests	2m 52s
Maven tests	2m 52s
sbt scripted tests (gen-scala-server, 2.12)	7m 55s
sbt scripted tests (gen-scala-server, 2.12)	7m 55s
Compile and test (2.12.20, 21)	3m 59s
Compile and test (2.12.20, 21)	3m 59s
Gradle tests	4m 0s
Gradle tests	4m 0s
sbt scripted tests (gen-java, 2.12)	3m 41s
sbt scripted tests (gen-java, 2.12)	3m 41s
Compile and test (2.13.16, 8)	4m 30s
Compile and test (2.13.16, 8)	4m 30s
Compile and test (2.13.16, 11)	4m 29s
Compile and test (2.13.16, 11)	4m 29s
Compile and test (2.13.16, 17)	4m 26s
Compile and test (2.13.16, 17)	4m 26s
Compile and test (2.13.16, 21)	4m 18s
Compile and test (2.13.16, 21)	4m 18s
Compile and test (3.3.4, 8)	4m 33s
Compile and test (3.3.4, 8)	4m 33s
Compile and test (3.3.4, 11)	4m 40s
Compile and test (3.3.4, 11)	4m 40s
Compile and test (3.3.4, 17)	4m 29s
Compile and test (3.3.4, 17)	4m 29s
Compile and test (3.3.4, 21)	3m 42s
Compile and test (3.3.4, 21)	4m 26s
	2h 35m 10s

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