Update maven-core, maven-plugin-api to 3.9.8 #868

Job	Run time
Docs	3m 5s
Docs	3m 5s
Docs	3m 5s
Compile Benchmarks	1m 34s
Compile Benchmarks	1m 34s
Compile Benchmarks	1m 34s
Compile and test (2.12.19, 8)	3m 55s
Compile and test (2.12.19, 8)	3m 55s
Compile and test (2.12.19, 8)	3m 55s
Checks	1m 57s
Checks	1m 57s
Checks	1m 57s
Compile and test (2.12.19, 11)	3m 53s
Compile and test (2.12.19, 11)	3m 53s
Compile and test (2.12.19, 11)	3m 53s
Gradle tests	3m 53s
Gradle tests	3m 53s
Gradle tests	3m 53s
Maven tests	2m 27s
Maven tests	2m 13s
Maven tests	2m 37s
Compile and test (2.12.19, 17)	3m 53s
Compile and test (2.12.19, 17)	3m 53s
Compile and test (2.12.19, 17)	3m 53s
sbt scripted tests (gen-scala-server, 2.12)	8m 24s
sbt scripted tests (gen-scala-server, 2.12)	8m 24s
sbt scripted tests (gen-scala-server, 2.12)	8m 24s
Compile and test (2.13.14, 8)	4m 28s
Compile and test (2.13.14, 8)	4m 28s
Compile and test (2.13.14, 8)	4m 28s
sbt scripted tests (gen-java, 2.12)	3m 42s
sbt scripted tests (gen-java, 2.12)	3m 42s
sbt scripted tests (gen-java, 2.12)	3m 42s
Compile and test (2.13.14, 11)	4m 29s
Compile and test (2.13.14, 11)	4m 29s
Compile and test (2.13.14, 11)	4m 29s
Compile and test (2.13.14, 17)	4m 25s
Compile and test (2.13.14, 17)	4m 25s
Compile and test (2.13.14, 17)	4m 25s
Compile and test (3.3.3, 8)	4m 40s
Compile and test (3.3.3, 8)	4m 40s
Compile and test (3.3.3, 8)	4m 40s
Compile and test (3.3.3, 11)	4m 35s
Compile and test (3.3.3, 11)	4m 35s
Compile and test (3.3.3, 11)	4m 35s
Compile and test (3.3.3, 17)	4m 38s
Compile and test (3.3.3, 17)	4m 38s
Compile and test (3.3.3, 17)	4m 38s
	3h 11m 50s

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