fix(deps): update dependency through2 to v5

Author: renovate[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "recursive-copy": "2.0.14",
     "rimraf": "6.1.3",
     "showdown": "2.1.0",
-    "through2": "4.0.2"
+    "through2": "5.0.1"
   },
   "peerDependencies": {
     "sass": ">=1.45.0 <2.0.0"