chore(deps): bump actions/download-artifact from 4 to 8

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/elizaos-os-full-release.yml

@@ -54,20 +54,20 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Download Linux ISO artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           pattern: elizaos-linux-iso-*
           path: ./_verify/iso
           merge-multiple: true
 
       - name: Download Debian package artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: elizaos-debian-package
           path: ./_verify/deb
 
       - name: Download VM image artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: elizaos-vm-image
           path: ./_verify/vm
@@ -104,7 +104,7 @@ jobs:
         with:
           bun-version: "1.3.13"
       - name: Download all release artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           path: ./_artifacts
           merge-multiple: true

.github/workflows/hetzner-e2e.yml

@@ -188,7 +188,7 @@ jobs:
 
       - name: Download state artifact
         if: steps.secret_config.outputs.configured == 'true'
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: hetzner-e2e-state
           path: /tmp/hetzner-e2e-state

.github/workflows/windows-store-release.yml

@@ -151,7 +151,7 @@ jobs:
     runs-on: windows-2025
     timeout-minutes: 30
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           name: windows-msix-${{ inputs.version }}