Bump actions/upload-artifact from 2 to 3

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/manage-prs.yml

@@ -114,7 +114,7 @@ jobs:
         run: echo "::set-output name=head::$(jq -c .head.sha "${{ steps.configuration.outputs.path }}/${{ env.JSON_IDENTIFIER }}")"
 
       - name: Upload diff file to workflow artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           path: ${{ steps.configuration.outputs.path }}/${{ steps.configuration.outputs.filename }}
           name: ${{ steps.configuration.outputs.artifact }}
@@ -380,7 +380,7 @@ jobs:
       # So it's necessary to use an alternative means of indicating that at least one submission failed the checks.
       - name: Upload failure flag artifact
         if: env.PASS == 'false'
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           if-no-files-found: error
           path: ${{ env.FAIL_FLAG_PATH }}

.github/workflows/sync-labels.yml

@@ -70,7 +70,7 @@ jobs:
           file-url: https://raw.githubusercontent.com/arduino/tooling-project-assets/main/workflow-templates/assets/sync-labels/${{ matrix.filename }}
 
       - name: Pass configuration files to next job via workflow artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           path: |
             *.yaml