install cmake 3.20 from pip

Author: patapenka-alexey

.github/workflows/testing.yml

@@ -120,7 +120,7 @@ jobs:
 
       # Temporary solution, waiting for the `checks` module update.
       - name: Install old CMake for checks dependency
-        run: pip3 install cmake==3.4
+        run: pip3 install cmake==3.20
 
       - name: Install the crud module for testing purposes
         run: |