scalapb: update to 0.11.7 #865

Job	Run time
Checks	1m 52s
Docs	2m 31s
Compile and test (2.12.19, 8)	3m 55s
Compile Benchmarks	1m 31s
Compile and test (2.12.19, 11)	3m 45s
Gradle tests	3m 44s
Maven tests	2m 46s
Compile and test (2.12.19, 17)	3m 57s
sbt scripted tests (gen-scala-server, 2.12)	7m 55s
Compile and test (2.13.14, 8)	4m 59s
sbt scripted tests (gen-java, 2.12)	3m 24s
Compile and test (2.13.14, 11)	4m 23s
Compile and test (2.13.14, 17)	4m 37s
Compile and test (3.3.3, 8)	4m 37s
Compile and test (3.3.3, 11)	5m 1s
Compile and test (3.3.3, 17)	4m 56s
	1h 3m 53s

Provide feedback