chore:(deps): bump @testing-library/user-event in /explorer (#13526)

Bumps [@testing-library/user-event](https://github.com/testing-library/user-event) from 12.2.0 to 12.2.2.
- [Release notes](https://github.com/testing-library/user-event/releases)
- [Changelog](https://github.com/testing-library/user-event/blob/master/CHANGELOG.md)
- [Commits](https://github.com/testing-library/user-event/compare/v12.2.0...v12.2.2)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

explorer/package-lock.json

@@ -2545,9 +2545,9 @@
       }
     },
     "@testing-library/user-event": {
-      "version": "12.2.0",
-      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-12.2.0.tgz",
-      "integrity": "sha512-Vnmm1ZvJ+JSQ7+lGIWMIdGbdLFQBAeWEAZJjw6dZwKWMwVTOBXMFbAxUCewQEVM0xfD4sGrYS/Hxec311WknGw==",
+      "version": "12.2.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-12.2.2.tgz",
+      "integrity": "sha512-mTYL9LrwiSeyorStUOMuRGQDn1ca40tIhuv//o/K3lY8wBEp+9Im90MFVx5i3u7zCPmavn3uWZs/10chsbI8Tg==",
       "requires": {
         "@babel/runtime": "^7.10.2"
       }

explorer/package.json

@@ -9,7 +9,7 @@
     "@solana/web3.js": "^0.86.4",
     "@testing-library/jest-dom": "^5.11.5",
     "@testing-library/react": "^11.1.1",
-    "@testing-library/user-event": "^12.2.0",
+    "@testing-library/user-event": "^12.2.2",
     "@types/bn.js": "^4.11.6",
     "@types/bs58": "^4.0.1",
     "@types/chai": "^4.2.14",