force install cmake 3.15.3 under sudo

Author: patapenka-alexey

.github/workflows/testing.yml

@@ -65,7 +65,7 @@ jobs:
 
       - name: Setup Tarantool ${{ matrix.tarantool }}
         if: matrix.tarantool != 'master'
-        uses: tarantool/setup-tarantool@v2
+        uses: tarantool/setup-tarantool@v3
         with:
           tarantool-version: ${{ matrix.tarantool }}
 
@@ -89,6 +89,7 @@ jobs:
       - name: Setup Tarantool master
         if: matrix.tarantool == 'master' && steps.cache-latest.outputs.cache-hit != 'true'
         run: |
+          sudo apt install cmake=3.15.3
           sudo tt install tarantool master
 
       - name: Add Tarantool master to PATH