Drop support for Scala 2.11 and 2.12 #2083

Job	Run time
check	1m 13s
bazel	1m 27s
bazel_aspect	3m 11s
Tests (ubuntu-latest, 11)	16m 7s
Maven tests (11)	2m 48s
Tests (ubuntu-latest, 17)	12m 25s
Maven tests (8)	2m 50s
Tests (ubuntu-latest, 21)	7m 42s
Tests (ubuntu-latest, 8)	15m 19s
Docker CLI tests (ubuntu-latest)	4m 56s
Maven tests (21)	2m 40s
Maven tests (17)	2m 54s
	1h 13m 32s

Provide feedback