We don't need @backstage/errors anymore

Signed-off-by: Karan Shah <karan.shah@simplybusiness.co.uk>

plugins/airbrake/package.json

@@ -27,7 +27,6 @@
     "@backstage/core-components": "^0.9.0",
     "@backstage/core-plugin-api": "^0.8.0",
     "@backstage/dev-utils": "^0.2.24",
-    "@backstage/errors": "^0.2.2",
     "@backstage/plugin-catalog-react": "^0.8.0",
     "@backstage/test-utils": "^0.3.0",
     "@backstage/theme": "^0.2.15",