Use latest version of CVMFS action

Author: ocaisa

action.yml

@@ -12,7 +12,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: cvmfs-contrib/github-action-cvmfs@d4641d0d591c9a5c3be23835ced2fb648b44c04b # v3.1
+    - uses: cvmfs-contrib/github-action-cvmfs@55899ca74cf78ab874bdf47f5a804e47c198743c # v4.0
       with:
         cvmfs_config_package: https://github.com/EESSI/filesystem-layer/releases/download/latest/cvmfs-config-eessi_latest_all.deb
         cvmfs_http_proxy: DIRECT