chore(deps): update actions/download-artifact action to v8 (main) (#14513)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/download-artifact](https://redirect.github.com/actions/download-artifact)
| action | major | `v7` → `v8` |

---

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---

### Release Notes

<details>
<summary>actions/download-artifact (actions/download-artifact)</summary>

###
[`v8`](https://redirect.github.com/actions/download-artifact/compare/v7...v8)

[Compare
Source](https://redirect.github.com/actions/download-artifact/compare/v7...v8)

</details>

---

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.github/workflows/test-build-deploy.yml

@@ -376,7 +376,7 @@ jobs:
           sudo mkdir -p /go/src/github.com/grafana/mimir
           sudo ln -s $GITHUB_WORKSPACE/* /go/src/github.com/grafana/mimir
       - name: Download mimirtool Docker Image
-        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
+        uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8
         with:
           name: docker-image-mimirtool
       - name: Extract Docker Image from Archive
@@ -389,7 +389,7 @@ jobs:
           # that's why we use docker run to run latest version.
           docker run -v /tmp/images:/tmp/images -v /var/run/docker.sock:/var/run/docker.sock quay.io/skopeo/stable:v1.15.1 copy oci-archive:/tmp/images/mimirtool.oci "docker-daemon:grafana/mimirtool:$IMAGE_TAG"
       - name: Download Archive with Docker Images
-        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
+        uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8
         with:
           name: test-docker-image-race-enabled-mimir
       - name: Load race-enabled mimir into Docker
@@ -454,7 +454,7 @@ jobs:
           mkdir -p /go/src/github.com/grafana/mimir
           ln -s $GITHUB_WORKSPACE/* /go/src/github.com/grafana/mimir
       - name: Download Archive with Docker Images
-        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
+        uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8
         with:
           pattern: docker-image-*
           path: built-images