Bump actions/upload-artifact from 6 to 7

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

---
updated-dependencies:
- dependency-name: actions/upload-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/package.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Package extension
         run: npx vsce package
       - name: Upload extension vsix to workflow artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: haskell-${{ github.sha }}.vsix
           path: haskell-*.vsix

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
 
       ## Make sure the artifact is added to the release.
       - name: Upload extension vsix to workflow artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: haskell-${{ github.event.release.tag_name }}.vsix
           path: ${{ steps.packageExtension.outputs.vsixPath }}