chore:(deps): bump @testing-library/user-event in /explorer (#15259)

Bumps [@testing-library/user-event](https://github.com/testing-library/user-event) from 12.6.3 to 12.7.0.
- [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/v12.6.3...v12.7.0)

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

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

explorer/package-lock.json

@@ -3352,9 +3352,9 @@
       }
     },
     "@testing-library/user-event": {
-      "version": "12.6.3",
-      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-12.6.3.tgz",
-      "integrity": "sha512-PCmbUKofE4SXA7l8jphZAbvv5H3c4ix34xPZ/GNe99fASX//msJRgiMbHIBP+GwRfgVG9c7zmkODSPu2X2vNRw==",
+      "version": "12.7.0",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-12.7.0.tgz",
+      "integrity": "sha512-KzRM1KNDoW8pJ2HTenrUhTjV6wJMHvWAagDs8DDrYSWz6y4PN+K2jSvlm2bMHWNRk5LTJPo9jqIjNjJ3FlqXNw==",
       "requires": {
         "@babel/runtime": "^7.12.5"
       },

explorer/package.json

@@ -9,7 +9,7 @@
     "@solana/web3.js": "^0.91.1",
     "@testing-library/jest-dom": "^5.11.9",
     "@testing-library/react": "^11.2.5",
-    "@testing-library/user-event": "^12.6.3",
+    "@testing-library/user-event": "^12.7.0",
     "@types/bn.js": "^5.1.0",
     "@types/bs58": "^4.0.1",
     "@types/chai": "^4.2.14",