update nikhef to cdn version

Author: stebo85

.github/workflows/test-cvmfs.yml

@@ -40,7 +40,7 @@ jobs:
                         "s1brisbane-cvmfs.openhtc.io",
                         "cvmfs-brisbane.neurodesk.org", 
                         "cvmfs-perth.neurodesk.org",
-                        "cvmfs01.nikhef.nl",
+                        "s1nikhef-cvmfs.openhtc.io",
                         "cvmfs-frankfurt.neurodesk.org",
                         "cvmfs-geoproximity.neurodesk.org",
                         "cvmfs1.neurodesk.org",