Bump actions/download-artifact from 6 to 7

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -59,7 +59,7 @@ jobs:
       contents: write
     steps:
       - name: Download built extensions
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
 
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
@@ -80,7 +80,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Download built extensions
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
 
       - name: Publish to store
         uses: PlasmoHQ/bpp@v3