Add compatibility with upload-artiact v4

Names of artifacts need to be distinct now

.github/workflows/primer_run_main.yaml

@@ -82,8 +82,9 @@ jobs:
         run: |
           . venv/bin/activate
           python tests/primer/__main__.py prepare --clone
-      - name: Upload output diff
+      - name: Upload commit string
         uses: actions/[email protected]
+        if: matrix.batchIdx == 0
         with:
           name: primer_commitstring
           path:
@@ -105,7 +106,9 @@ jobs:
       - name: Upload output
         uses: actions/[email protected]
         with:
-          name: primer_output
+          name:
+            primer_output_main_${{ steps.python.outputs.python-version }}_batch${{
+            matrix.batchIdx }}
           path: >-
             tests/.pylint_primer_tests/output_${{ steps.python.outputs.python-version
             }}_main_batch${{ matrix.batchIdx }}.txt

.github/workflows/primer_run_pr.yaml

@@ -174,14 +174,18 @@ jobs:
       - name: Upload output of PR
         uses: actions/[email protected]
         with:
-          name: primer_output_pr
+          name:
+            primer_output_pr_${{ steps.python.outputs.python-version }}_batch${{
+            matrix.batchIdx }}
           path:
             tests/.pylint_primer_tests/output_${{ steps.python.outputs.python-version
             }}_pr_batch${{ matrix.batchIdx }}.txt
       - name: Upload output of 'main'
         uses: actions/[email protected]
         with:
-          name: primer_output_main
+          name:
+            primer_output_main_${{ steps.python.outputs.python-version }}_batch${{
+            matrix.batchIdx }}
           path:
             output_${{ steps.python.outputs.python-version }}_main_batch${{
             matrix.batchIdx }}.txt
@@ -191,6 +195,8 @@ jobs:
         run: |
           echo ${{ github.event.pull_request.number }} | tee pr_number.txt
       - name: Upload PR number
+        if:
+          startsWith(steps.python.outputs.python-version, '3.8') && matrix.batchIdx == 0
         uses: actions/[email protected]
         with:
           name: pr_number