Bump actions/setup-node from 6 to 7

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 6 to 7.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v6...v7)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Set up Node ${{ matrix.node-version }}
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v7
         with:
           node-version: ${{ matrix.node-version }}
       - name: Set up Python ${{ matrix.python-version }}

.github/workflows/milestone-publish.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up Node
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v7
         with:
           node-version: 26
           registry-url: https://registry.npmjs.org/