fix: plugins/search-react/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-WEBPACKDEVSERVER-10300775
- https://snyk.io/vuln/SNYK-JS-WEBPACKDEVSERVER-10300777

Author: snyk-io[bot]

plugins/search-react/package.json

@@ -35,7 +35,7 @@
     "@backstage/core-plugin-api": "workspace:^",
     "@backstage/plugin-search-common": "workspace:^",
     "@backstage/theme": "workspace:^",
-    "@backstage/types": "workspace:^",
+    "@backstage/types": "0.1.1",
     "@backstage/version-bridge": "workspace:^",
     "@material-ui/core": "^4.12.2",
     "@material-ui/icons": "^4.9.1",