Drop support for Scala 2.11 and 2.12 #2084

Job	Run time
bazel_aspect	2m 48s
Docker CLI tests (ubuntu-latest)	4m 18s
Maven tests (17)	2m 31s
bazel	1m 30s
check	4m 18s
Tests (ubuntu-latest, 8)	15m 54s
Maven tests (11)	2m 38s
Tests (ubuntu-latest, 11)	15m 1s
Maven tests (8)	2m 24s
Maven tests (21)	2m 26s
Tests (ubuntu-latest, 17)	11m 13s
Tests (ubuntu-latest, 21)	7m 39s
	1h 12m 40s

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