version bump: erlang otp-19.3.1

also remove the onbuild images for docker-library#2076

library/erlang

@@ -3,18 +3,14 @@
 Maintainers: Mr C0B <[email protected]> (@c0b)
 GitRepo: https://github.com/c0b/docker-erlang-otp.git
 
-Tags: 19.3, 19, latest
-GitCommit: 9584350e96a6fed028ed858312d8de43a0e238e0
+Tags: 19.3.1, 19.3, 19, latest
+GitCommit: 3d50589fa66aedda3bf11419cd81fdadf5cc6ee3
 Directory: 19
 
-Tags: 19.3-slim, 19-slim, slim
-GitCommit: 9584350e96a6fed028ed858312d8de43a0e238e0
+Tags: 19.3.1-slim, 19.3-slim, 19-slim, slim
+GitCommit: 3d50589fa66aedda3bf11419cd81fdadf5cc6ee3
 Directory: 19/slim
 
-Tags: 19.3-onbuild, 19-onbuild, onbuild
-GitCommit: 1b03fdd83ec769e7962ec0dce01e25613a46dacf
-Directory: 19/onbuild
-
 Tags: 18.3.4.5, 18.3.4, 18.3, 18
 GitCommit: 1b03fdd83ec769e7962ec0dce01e25613a46dacf
 Directory: 18
@@ -23,10 +19,6 @@ Tags: 18.3.4.5-slim, 18.3.4-slim, 18.3-slim, 18-slim
 GitCommit: 1b03fdd83ec769e7962ec0dce01e25613a46dacf
 Directory: 18/slim
 
-Tags: 18.3.4.5-onbuild, 18.3.4-onbuild, 18.3-onbuild, 18-onbuild
-GitCommit: 20e41464075dc0fc76709be77701530eddb6fe33
-Directory: 18/onbuild
-
 Tags: 17.5.6.9, 17.5.6, 17.5, 17
 GitCommit: ea32d5f6f1735f9f55bee04b112166da96eb9c73
 Directory: 17