Upgrade actions/upload-artifact v3.1.3 -> v4.0.0 (#921)

See:
- https://github.com/actions/upload-artifact/releases/tag/v4.0.0
- actions/upload-artifact@v3.1.3...v4.0.0

.github/workflows/pitest-analyze-pr.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Aggregate Pitest reports
         run: mvn pitest-git:aggregate -DkilledEmoji=":tada:" -DmutantEmoji=":zombie:" -DtrailingText="Mutation testing report by [Pitest](https://pitest.org/). Review any surviving mutants by inspecting the line comments under [_Files changed_](${{ github.event.number }}/files)."
       - name: Upload Pitest reports as artifact
-        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
+        uses: actions/upload-artifact@c7d193f32edcb7bfad88892161225aeda64e9392 # v4.0.0
         with:
           name: pitest-reports
           path: ./target/pit-reports-ci

.github/workflows/run-integration-tests.yml

@@ -35,7 +35,7 @@ jobs:
         run: xvfb-run ./integration-tests/checkstyle-10.12.4.sh "${{ runner.temp }}/artifacts"
       - name: Upload artifacts on failure
         if: ${{ failure() }}
-        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 # v3.1.3
+        uses: actions/upload-artifact@c7d193f32edcb7bfad88892161225aeda64e9392 # v4.0.0
         with:
           name: integration-test-checkstyle-10.12.4
           path: "${{ runner.temp }}/artifacts"