ci: bump the actions group with 2 updates

Bumps the actions group with 2 updates: [korthout/backport-action](https://github.com/korthout/backport-action) and [actions/setup-node](https://github.com/actions/setup-node).


Updates `korthout/backport-action` from 4 to 4.4.0
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](https://github.com/korthout/backport-action/compare/v4...v4.4.0)

Updates `actions/setup-node` from 6.3.0 to 6.4.0
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v6.3.0...v6.4.0)

---
updated-dependencies:
- dependency-name: korthout/backport-action
  dependency-version: 4.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: actions/setup-node
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

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

.github/workflows/backport.yml

@@ -24,7 +24,7 @@ jobs:
           private-key: ${{ secrets.BACKPORT_KEY }}
 
       - name: Create backport PR
-        uses: korthout/backport-action@v4
+        uses: korthout/backport-action@v4.4.0
         with:
           pull_title: "${pull_title}"
           label_pattern: "^ci:backport ([^ ]+)$"

.github/workflows/build.yml

@@ -116,7 +116,7 @@ jobs:
 
     - name: Set up Node.js
       if: contains(matrix.features, 'wasm') && (matrix.run-wasm-test || !inputs.run-test)
-      uses: actions/setup-node@v6.3.0
+      uses: actions/setup-node@v6.4.0
       with:
         node-version: 24
         cache: npm

.github/workflows/release.yml

@@ -108,7 +108,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Set up Node
-        uses: actions/setup-node@v6.3.0
+        uses: actions/setup-node@v6.4.0
         with:
           node-version: 24
           registry-url: https://registry.npmjs.org