Update dependency sass to v1.64.0

Author: renovate[bot]

app/package.json

@@ -29,7 +29,7 @@
     "@vue/cli-plugin-pwa": "4.5.12",
     "@vue/cli-service": "4.5.12",
     "node-sass": "5.0.0",
-    "sass": "1.32.11",
+    "sass": "1.64.0",
     "sass-loader": "11.0.1",
     "vue-cli-plugin-vuetify": "2.3.1",
     "vue-template-compiler": "2.6.12",