Bump actions/setup-node from 7 to 7 in /.github/actions/build-vsix

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 7 to 7.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v7...8207627)

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

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

Author: dependabot[bot]

.github/actions/build-vsix/action.yml

@@ -22,7 +22,7 @@ runs:
   using: 'composite'
   steps:
     - name: Install Node
-      uses: actions/setup-node@v7
+      uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
       with:
         node-version: ${{ inputs.node_version }}
         cache: 'npm'