Don't fail the entire CI run just because of cache saving error

Update ccache-action to a not yet released version including the fix for
failing the entire CI job if saving the cache failed -- this shouldn't
happen at all, but in practice it does happen from time to time, and
it's better to succeed, rather than fail in this case.

.github/workflows/ci.yml

@@ -116,7 +116,7 @@ jobs:
           submodules: 'recursive'
 
       - name: Install CCache
-        uses: hendrikmuhs/ccache-action@v1.2.1
+        uses: hendrikmuhs/ccache-action@578e14bc3f06099346125f52ed0008433eccbedf
         with:
           key: ${{ matrix.name }}
 

.github/workflows/ci_msw_cross.yml

@@ -131,7 +131,7 @@ jobs:
           submodules: 'recursive'
 
       - name: Install CCache
-        uses: hendrikmuhs/ccache-action@v1.2.1
+        uses: hendrikmuhs/ccache-action@578e14bc3f06099346125f52ed0008433eccbedf
         with:
           key: ${{ matrix.name }}