ocaml.5.4 in CI workflow

note: the restriction is too strict and only useful for the
stall-detector, it will be relaxed

Author: raphael-proust

.github/workflows/workflow.yml

@@ -15,23 +15,19 @@ jobs:
         os:
           - ubuntu-latest
         ocaml-compiler:
-          - "4.14"
-          - "5.0"
-          - "5.1"
-          - "5.2"
-          - "5.3"
+          - "5.4"
         libev:
           - true
           - false
         include:
           - os: ubuntu-24.04-arm
-            ocaml-compiler: "5.3"
+            ocaml-compiler: "5.4"
             libev: false
           - os: macos-latest
-            ocaml-compiler: "5.3"
+            ocaml-compiler: "5.4"
             libev: false
           - os: windows-latest
-            ocaml-compiler: "5.3"
+            ocaml-compiler: "5.4"
             libev: false
 
     runs-on: ${{ matrix.os }}