Bump @azure/identity from 3.3.2 to 4.2.1

Author: renovate-pagopa[bot]

apps/io-sign-backoffice-app/package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@azure/arm-apimanagement": "^9.1.0",
     "@azure/cosmos": "^3.17.3",
-    "@azure/identity": "^3.3.0",
+    "@azure/identity": "^4.0.0",
     "@emotion/cache": "^11.14.0",
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.1",