scalapb: update to 0.11.7 (#324) #866

Job	Run time
Docs	2m 43s
Checks	1m 51s
Compile Benchmarks	1m 23s
Compile and test (2.12.19, 8)	3m 55s
Compile and test (2.12.19, 11)	3m 42s
Maven tests	2m 42s
Gradle tests	3m 48s
Compile and test (2.12.19, 17)	3m 55s
sbt scripted tests (gen-scala-server, 2.12)	7m 48s
sbt scripted tests (gen-java, 2.12)	3m 40s
Compile and test (2.13.14, 8)	4m 35s
Compile and test (2.13.14, 11)	4m 19s
Compile and test (2.13.14, 17)	4m 46s
Compile and test (3.3.3, 8)	4m 33s
Compile and test (3.3.3, 11)	4m 16s
Compile and test (3.3.3, 17)	4m 14s
	1h 2m 10s

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