chore: Update dependencies (#78)

Updates dependencies as part of regular maintenance to ensure dependencies are kept up-to-date.
- sass v1.86.1
- gel-sass-tools v4.0.0

Author: randombitsUK

package-lock.json

@@ -37,10 +37,10 @@
   "devDependencies": {
     "jest": "29.7.0",
     "prettier": "3.5.3",
-    "sass": "1.86.0"
+    "sass": "1.86.1"
   },
   "dependencies": {
-    "gel-sass-tools": "4.0.0-beta.4",
+    "gel-sass-tools": "4.0.0",
     "sass-mq": "7.0.0-beta.1"
   }
 }