ci(github-actions): bump actions/setup-node from 5 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/release-please.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Node.js LTS
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
          node-version: 24.x
 
@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Node.js LTS
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 24.x
 
@@ -64,7 +64,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Node.js LTS
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 24.x