chore(deps): update dependency @edx/frontend-build to v12.8.40

Author: renovate[bot]

package-lock.json

@@ -35,7 +35,7 @@
   "devDependencies": {
     "@edx/brand": "npm:@edx/[email protected]",
     "@edx/browserslist-config": "^1.1.1",
-    "@edx/frontend-build": "12.8.38",
+    "@edx/frontend-build": "12.8.40",
     "@edx/frontend-platform": "4.5.0",
     "@edx/paragon": "^20.19.0",
     "@edx/reactifex": "^2.1.1",