revert cvmfs version

Author: Moelf

.github/workflows/cvmfs.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: cvmfs-contrib/github-action-cvmfs@v4
       - name: Read root file in C++
         run: |
-          source /cvmfs/sft.cern.ch/lcg/views/dev3/latest/x86_64-ubuntu2204-gcc14-opt/setup.sh
+          source /cvmfs/sft.cern.ch/lcg/views/dev3/latest/x86_64-ubuntu2204-gcc11-opt/setup.sh
           python ./test/RNTupleWriting/test1.py test1.root
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v4