Bump microsoft/setup-msbuild from 2 to 3

Bumps [microsoft/setup-msbuild](https://github.com/microsoft/setup-msbuild) from 2 to 3.
- [Release notes](https://github.com/microsoft/setup-msbuild/releases)
- [Commits](microsoft/setup-msbuild@v2...v3)

---
updated-dependencies:
- dependency-name: microsoft/setup-msbuild
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/steamkit2-build.yaml

@@ -143,7 +143,7 @@ jobs:
         restore-keys: vcpkg-${{ matrix.platform }}-
 
     - name: Add MSBuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
 
     - name: Configure Dependencies
       run: pwsh -File Resources/NetHook2/SetupDependencies.ps1