fix: remove obsolete package

package.json

@@ -34,7 +34,6 @@
     "@spotify/eslint-config-oss": "^1.0.1",
     "file-loader": "^6.0.0",
     "husky": "^4.2.3",
-    "identity-obj-proxy": "^3.0.0",
     "lerna": "^3.20.2",
     "lint-staged": "^10.1.0",
     "patch-package": "^6.2.2",

yarn.lock

@@ -10861,7 +10861,7 @@ icss-utils@^4.0.0, icss-utils@^4.1.1:
   dependencies:
     postcss "^7.0.14"
 
-identity-obj-proxy@3.0.0, identity-obj-proxy@^3.0.0:
+identity-obj-proxy@3.0.0:
   version "3.0.0"
   resolved "https://registry.npmjs.org/identity-obj-proxy/-/identity-obj-proxy-3.0.0.tgz#94d2bda96084453ef36fbc5aaec37e0f79f1fc14"
   integrity sha1-lNK9qWCERT7zb7xarsN+D3nx/BQ=