GitHub Actions: Update actions-setup-cmake to v2

Fixes warnings regarding deprecated node12

.github/workflows/test.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: ilammy/msvc-dev-cmd@v1
       - uses: seanmiddleditch/gha-setup-ninja@master
-      - uses: jwlawson/actions-setup-cmake@v1.8
+      - uses: jwlawson/actions-setup-cmake@v2
         with:
           cmake-version: ${{ matrix.cmake }}