Fix CI build step after merging

The OS on the machine (lxir116) used for this step was updated again. This
time to Debian12 which results in failing tests for this stage. Update the
xrequirements in the CI description.

.gitlab-ci.yml

@@ -334,13 +334,13 @@ FileLicenceCheck:
     - CbmRoot
 
 .linux_variables: &linux_variables
-    OS: "Debian11"
+    OS: "Debian12"
     NCPU: 5
     FAIRSOFT_VERSION: "nov22p1"
     FAIRROOT_VERSION: "v18.8.0"
-    BASE_PATH: "/cvmfs/fairsoft.gsi.de/debian11"
+    BASE_PATH: "/cvmfs/fairsoft.gsi.de/debian12"
     SIMPATH: "$BASE_PATH/fairsoft/$FAIRSOFT_VERSION"
-    FAIRROOTPATH: "$BASE_PATH/fairroot/${FAIRROOT_VERSION}_${FAIRSOFT_VERSION}"
+    FAIRROOTPATH: "$BASE_PATH/fairroot/${FAIRROOT_VERSION}_fs_${FAIRSOFT_VERSION}"
     EXTRA_PATH: "${SIMPATH}/bin"
 
 .macosx_tag: &macosx_tag