build: add missing dep in test to fix CI

Author: alan-agius4

tests/legacy-cli/e2e/assets/18-ssr-project-webpack/package.json

@@ -35,6 +35,7 @@
     "@angular/compiler-cli": "^18.0.0-next.0",
     "@types/express": "^4.17.17",
     "@types/jasmine": "~4.3.0",
+    "@types/mime": "^3.0.0",
     "@types/node": "^18.18.0",
     "jasmine-core": "~4.6.0",
     "karma": "~6.4.0",