fix: downgrade actions versions in GitHub Actions workflow

Author: ClaudioESSilva

.github/workflows/publish.yml

@@ -12,9 +12,9 @@ jobs:
       contents: read
       id-token: write   # required for github-oidc login
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v4
 
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@v4
         with:
           node-version: '24'
           registry-url: 'https://registry.npmjs.org'
@@ -23,9 +23,7 @@ jobs:
         run: npm ci && npm run build
 
       - name: Publish to npm
-        run: npm publish --access public
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: npm publish --access public --provenance
 
       - name: Install mcp-publisher
         run: |