ci: bump darenm/Setup-VSTest to 1.2 (#1225)

Node.js 12 actions are deprecated. For more information see:
https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/

Author: tido64

.github/actions/setup-toolchain/action.yml

@@ -47,7 +47,7 @@ runs:
         bundler-cache: true
     - name: Set up VSTest.console.exe
       if: ${{ inputs.platform == 'windows' }}
-      uses: darenm/Setup-VSTest@v1
+      uses: darenm/Setup-VSTest@v1.2
     - name: Generate cache key
       id: cache-key-generator
       run: |