Set a fixed version of cmake to fix issues with GitHub actions

.github/workflows/ResInsightWithCache.yml

@@ -8,7 +8,6 @@ on:
     # build cache is 
     - cron: '0 1 * * * '
 env:
-  NINJA_VERSION: 1.9.0
   BUILD_TYPE: Release
   BUILDCACHE_VERSION: 0.24.4
   BUILDCACHE_DIR: ${{ github.workspace }}/buildcache_dir
@@ -73,10 +72,11 @@ jobs:
           python-version: '3.8'
       - name: Display Python version
         run: python -c "import sys; print(sys.version)"
-      - name: Download Ninja
-        uses: seanmiddleditch/gha-setup-ninja@master
-        with:
-          version: ${{ env.NINJA_VERSION }}
+      
+        # workaround a poor interaction between github actions/cmake/vcpkg, see https://github.com/lukka/run-vcpkg/issues/88#issuecomment-885758902
+      - name: Use CMake 3.20.1
+        uses: lukka/get-cmake@v3.20.1
+
       - name: Download buildcache
         id: buildcache-download
         shell: cmake -P {0}