chore(deps): bump @types/react-dom from 16.9.5 to 16.9.8 in /explorer

Bumps [@types/react-dom](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom) from 16.9.5 to 16.9.8.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-dom)

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

explorer/package-lock.json

@@ -2943,9 +2943,9 @@
       }
     },
     "@types/react-dom": {
-      "version": "16.9.5",
-      "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-16.9.5.tgz",
-      "integrity": "sha512-BX6RQ8s9D+2/gDhxrj8OW+YD4R+8hj7FEM/OJHGNR0KipE1h1mSsf39YeyC81qafkq+N3rU3h3RFbLSwE5VqUg==",
+      "version": "16.9.8",
+      "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-16.9.8.tgz",
+      "integrity": "sha512-ykkPQ+5nFknnlU6lDd947WbQ6TE3NNzbQAkInC2EKY1qeYdTKp7onFusmYZb+ityzx2YviqT6BXSu+LyWWJwcA==",
       "requires": {
         "@types/react": "*"
       }

explorer/package.json

@@ -12,7 +12,7 @@
     "@types/jest": "^26.0.0",
     "@types/node": "^12.0.0",
     "@types/react": "^16.9.38",
-    "@types/react-dom": "^16.9.0",
+    "@types/react-dom": "^16.9.8",
     "@types/react-router-dom": "^5.1.3",
     "bootstrap": "^4.5.0",
     "bs58": "^4.0.1",