Build with only one older OCaml version (#7797)

Author: cknitt

.github/workflows/ci.yml

@@ -58,15 +58,7 @@ jobs:
             node-target: win32-x64
             rust-target: x86_64-pc-windows-gnu
 
-          # Verify that the compiler still builds with older OCaml versions
-          - os: ubuntu-24.04
-            ocaml_compiler: ocaml-variants.5.2.1+options,ocaml-option-static
-            node-target: linux-x64
-            rust-target: x86_64-unknown-linux-musl
-          - os: ubuntu-24.04
-            ocaml_compiler: ocaml-variants.5.0.0+options,ocaml-option-static
-            node-target: linux-x64
-            rust-target: x86_64-unknown-linux-musl
+          # Verify that the compiler still builds with the oldest OCaml version we support.
           - os: ubuntu-24.04
             ocaml_compiler: ocaml-variants.4.14.2+options,ocaml-option-static
             node-target: linux-x64