Update node-sass and sass-loader

Avoids having to install Python 2: sass/node-sass#2877

Set sass-loader to 10.x instead of 11.x because it's incompatible with Vue 2: https://stackoverflow.com/a/66087132/10434371

package.json

@@ -55,7 +55,7 @@
     "lint-staged": "^7.2.0",
     "merge": "^1.2.1",
     "nanoid": "^2.0.0",
-    "node-sass": "^4.13.1",
+    "node-sass": "^6.0.0",
     "prettier-eslint": "^8.8.2",
     "rollup": "^0.67.3",
     "rollup-plugin-analyzer": "^2.1.0",
@@ -65,7 +65,7 @@
     "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-plugin-replace": "^2.1.0",
     "rollup-plugin-typescript2": "^0.18.0",
-    "sass-loader": "^7.0.3",
+    "sass-loader": "^10.2.0",
     "ts-jest": "^23.0.0",
     "typescript": "^3.0.0",
     "vue": "^2.6.7",