Delete old lockfiles

Otherwise it will give an error that the artifacts already exist.

Author: maresb

.github/workflows/update-lockfile.yml

@@ -47,6 +47,9 @@ jobs:
     steps:
     - name: Checkout repo
       uses: actions/checkout@v4
+    - name: Delete old lockfiles
+      run: |
+        rm -f conda/conda-lock-*.yaml
     - name: Download all lockfiles
       uses: actions/download-artifact@v2
       with: