Removed mostly-unmaintained dev dependency 'temp'

temp has seen some recent maintainer activity but there haven't been
any commits since 2021 and PRs have gone un-addressed for years. It's
one of the dev dependencies that depends on very old versions of rimraf.

package.json

@@ -48,9 +48,9 @@
     "jsdom": "^26.0.0",
     "load-grunt-tasks": "^5.1.0",
     "prettier": "1.17.1",
+    "rimraf": "^5.0.10",
     "sass": "^1.58.3",
-    "shelljs": "^0.9.2",
-    "temp": "^0.9.0"
+    "shelljs": "^0.9.2"
   },
   "browserslist": [
     "Safari >= 15",