Bump the github-actions group

Bumps the github-actions group in /.github/workflows/bootstrap with 1 update: [actions/setup-dotnet](https://github.com/actions/setup-dotnet).

- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/bootstrap/action.yml

@@ -36,12 +36,12 @@ runs:
           ${{ runner.os }}-nuget
           
     # Install .NET version as mandated by global.json
-    #- uses: actions/setup-dotnet@v3
+    #- uses: actions/setup-dotnet@v4
     #  with:
     #      global-json-file: global.json
 
     -   name: Setup dotnet
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: |
             6.0.100