ci(release): upgrade actions to Node.js 24

GitHub Actions will force Node.js 24 by default on June 2, 2026.
Upgrade the two flagged actions to their Node 24 compatible versions:

- actions/download-artifact@v4 -> v7
- mikepenz/release-changelog-builder-action@v5 -> v6

Author: kaplanz

.github/workflows/release.yml

@@ -276,11 +276,11 @@ jobs:
       id-token: write
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
 
       - name: Build Changelog
         id: build_changelog
-        uses: mikepenz/release-changelog-builder-action@v5
+        uses: mikepenz/release-changelog-builder-action@v6
         with:
           mode: "HYBRID" # Include both PRs and direct commits
           configurationJSON: |
@@ -409,7 +409,7 @@ jobs:
 
     steps:
     - name: Download all the dists
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v7
       with:
         pattern: python-package-*
         path: dist/