Bump microsoft/setup-msbuild from 2 to 3 (#109)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/CI_build.yml

@@ -16,7 +16,7 @@ jobs:
            choco install swissfileknife
 
     - name: Add msbuild to PATH
-      uses: microsoft/setup-msbuild@v2
+      uses: microsoft/setup-msbuild@v3
 
     - name: Build plugin dlls
       working-directory: .\NppExec