move cmake installation before taraantool master

Author: patapenka-alexey

.github/workflows/testing.yml

@@ -64,6 +64,10 @@ jobs:
           tt version
           tt init
 
+      # Waiting until `checks` repo will be updated.
+      - name: Install old CMake
+        run: pip3 install cmake==3.15.3
+
       - name: Install tarantool ${{ matrix.tarantool }}
         if: matrix.tarantool != 'master'
         uses: tarantool/setup-tarantool@v3
@@ -118,10 +122,6 @@ jobs:
       - name: Install test requirements
         run: pip3 install -r requirements-test.txt
 
-      # Waiting until `checks` repo will be updated.
-      - name: Install old CMake
-        run: pip3 install cmake==3.15.3
-
       - name: Install the crud module for testing purposes
         run: tt rocks install crud 1.4.2