Upgrade GitHub Action references

Older actions relied on older versions of Node, which have been deprecated. Referenced actions should use Node 20, rather than Node 16 or Node 12.

.github/workflows/build.yml

@@ -22,16 +22,16 @@ jobs:
       PLATFORM: ${{ matrix.platform }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: Checkout NAS2D
       run: git submodule update --init nas2d-core/
 
     - name: Add MSBuild to PATH
-      uses: microsoft/setup-msbuild@v1.0.2
+      uses: microsoft/setup-msbuild@v1.3.2
 
     - name: Restore vcpkg dependency cache
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       id: cache
       with:
         path: vcpkg_installed