Make cache dependant on script changes

.github/workflows/build.yml

@@ -58,10 +58,10 @@ jobs:
           echo "QMAKE_FLAGS=QMAKE_CXX=g++-9 QMAKE_CC=gcc-9" >> $GITHUB_ENV
 
       - name: Cache dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: deps
-          key: ${{ env.OS }}-deps
+          key: ${{ env.OS }}-${{ hashFiles('./share/ci/*.py') }}
 
       - name: Make a release
         shell: bash