build(deps): bump the artifact-actions group with 2 updates (#6026)

Bumps the artifact-actions group with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/upload-artifact` from 3 to 4
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

Updates `actions/download-artifact` from 3 to 4
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build_tag.yaml

@@ -73,7 +73,7 @@ jobs:
           export CONTOUR_E2E_IMAGE="ghcr.io/projectcontour/contour:$(git describe --tags)"
           make setup-kind-cluster run-gateway-conformance cleanup-kind
       - name: Upload gateway conformance report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: gateway-conformance-report
           path: gateway-conformance-report/projectcontour-contour-*.yaml

.github/workflows/prbuild.yaml

@@ -103,7 +103,7 @@ jobs:
       run: |
         make multiarch-build
     - name: Upload image
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: image
         path: image/contour-*.tar
@@ -142,7 +142,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Download image
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: image
           path: image
@@ -204,7 +204,7 @@ jobs:
           # recent release tag.
           fetch-depth: 0
       - name: Download image
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: image
           path: image
@@ -336,7 +336,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Download image
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: image
           path: image