ci: update GitHub Actions to Node.js 24 compatible versions (#36)

- actions/checkout v5 → v6
- actions/upload-artifact v5 → v7
- actions/download-artifact v5 → v8

Resolves Node.js 20 deprecation warnings (mandatory June 2026).

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: montfort

.github/workflows/release-cli.yml

@@ -67,7 +67,7 @@ jobs:
             archive: zip
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ needs.resolve-version.outputs.tag }}
 
@@ -113,7 +113,7 @@ jobs:
           echo "ARCHIVE=$ARCHIVE" >> "$GITHUB_ENV"
 
       - name: Upload binary artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v7
         with:
           name: cli-${{ matrix.target }}
           path: ${{ env.ARCHIVE }}
@@ -123,10 +123,10 @@ jobs:
     needs: [resolve-version, build-cli]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Download all artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v8
         with:
           path: release-artifacts
 

.github/workflows/release-framework.yml

@@ -18,7 +18,7 @@ jobs:
     name: Package Framework
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.inputs.tag || github.ref_name }}