GitHub workflows [dependabot]: Bump dawidd6/action-download-artifact

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 6 to 21.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v6...v21)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-version: '21'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/abi-stable.yaml

@@ -33,7 +33,7 @@ jobs:
       - name: try to download ABI for ${{ env.PARENT_TAG }}
         id: download_abi
         continue-on-error: true
-        uses: dawidd6/action-download-artifact@v6
+        uses: dawidd6/action-download-artifact@v21
         with:
           workflow: abi-stable.yaml
           workflow_conclusion: ''
@@ -90,7 +90,7 @@ jobs:
           ref: ${{ github.ref }}
       - name: download ABI for ${{ env.PARENT_TAG }}
         id: download_abi
-        uses: dawidd6/action-download-artifact@v6
+        uses: dawidd6/action-download-artifact@v21
         with:
           workflow: abi-stable.yaml
           workflow_conclusion: ''

.github/workflows/abi.yaml

@@ -29,7 +29,7 @@ jobs:
       - name: get reference ABI
         id: reference
         continue-on-error: true
-        uses: dawidd6/action-download-artifact@v6
+        uses: dawidd6/action-download-artifact@v21
         with:
           workflow: abi.yaml
           branch: ${{ env.ABI_BRANCH }}