version matrix: remove very-old versions, add newer versions

Author: gasche

.github/workflows/build-and-test.yml

@@ -16,17 +16,12 @@ jobs:
           # - macos-latest
           # - windows-latest
         ocaml-compiler:
-          - 4.05.x
-          - 4.06.x
-          - 4.07.x
-          - 4.08.x
-          - 4.09.x
-          - 4.10.x
-          - 4.11.x
-          - 4.12.x
-          - 4.13.x
           - 4.14.x
           - 5.0.x
+          - 5.1.x
+          - 5.2.x
+          - 5.3.x
+          - 5.4.x
 
     runs-on: ${{ matrix.os }}