Pin dart-sass to 1.77.6 to avoid deprecation warnings (#5552)

twbs/bootstrap#40962
twbs/bootstrap#40849

Author: browniebroke

{{cookiecutter.project_slug}}/package.json

@@ -26,7 +26,7 @@
     "postcss": "^8.3.11",
     "postcss-loader": "^8.0.0",
     "postcss-preset-env": "^10.0.3",
-    "sass": "^1.43.4",
+    "sass": "1.77.6",
     "sass-loader": "^16.0.1",
     "webpack": "^5.65.0",
     "webpack-bundle-tracker": "^3.0.1",