Bump artifacts version

Author: maresb

.github/workflows/update-lockfile.yml

@@ -37,7 +37,7 @@ jobs:
         --lockfile conda/conda-lock-${{ matrix.python-version }}.yaml
 
     - name: Upload lockfile
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: conda-lock-${{ matrix.python-version }}.yaml
         path: conda/conda-lock-${{ matrix.python-version }}.yaml
@@ -52,14 +52,13 @@ jobs:
       run: |
         rm -f conda/conda-lock-*.yaml
     - name: Download all lockfiles
-      uses: actions/download-artifact@v2
+      uses: actions/download-artifact@v4
       with:
           path: conda
     - name: Print diff
       run: |
         pwd
-        ls -al conda
-        ls -al /home/runner/work/CausalPy/CausalPy/conda/
+        ls -alR conda
         git status
         git diff
     - name: Open a pull request