Update to Github CI to use actions/checkout@v4 and matlab-actions/set…

…up-matlab@v2.

For the latter, I had to use the undocumented 'run-matlab-command'.

Ref: matlab-actions/setup-matlab#89 (comment)

action.yml

@@ -44,10 +44,8 @@ runs:
         echo "ML_CMD=run-matlab-command" >> $GITHUB_ENV
         echo "ML_PATHVAR=MATLABPATH" >> $GITHUB_ENV
       shell: bash
-#         echo `run-matlab-command "regexp(version, '(?<=\().*(?=\))', 'match', 'once')" | sed 's/ //g;s/\x27//g;s/ans=//g'` > matlab_release.txt
-#         export MATLAB_REL=`cat matlab_release.txt`
+#         export MATLAB_VER=`matlab -nojvm -batch "fprintf('%s', ver('matlab').Version)"`
 #         export MATLAB_REL=`ls /opt/hostedtoolcache/MATLAB`
-#         export MATLAB_REL=`run-matlab-command "regexp(version, '(?<=\().*(?=\))', 'match', 'once')" | sed 's/ //g;s/\x27//g;s/ans=//g'`
 
     - name: Set MATLAB_VER, ML_VER
       run: |