bump version of cvmfs action to address Node.js deprecation note

Author: truib

.github/workflows/test-software.eessi.io.yml

@@ -25,7 +25,7 @@ jobs:
           uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
         - name: Mount EESSI CernVM-FS pilot repository
-          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

.github/workflows/tests_archdetect.yml

@@ -25,7 +25,7 @@ jobs:
       uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
     - name: Mount EESSI CernVM-FS pilot repository
-      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