chore:(deps): bump @types/jest from 26.0.20 to 26.0.21 in /explorer (#15982)

Bumps [@types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.20 to 26.0.21.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest)

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

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

explorer/package-lock.json

@@ -3130,9 +3130,9 @@
       }
     },
     "@types/jest": {
-      "version": "26.0.20",
-      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-26.0.20.tgz",
-      "integrity": "sha512-9zi2Y+5USJRxd0FsahERhBwlcvFh6D2GLQnY2FH2BzK8J9s9omvNHIbvABwIluXa0fD8XVKMLTO0aOEuUfACAA==",
+      "version": "26.0.21",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-26.0.21.tgz",
+      "integrity": "sha512-ab9TyM/69yg7eew9eOwKMUmvIZAKEGZYlq/dhe5/0IMUd/QLJv5ldRMdddSn+u22N13FP3s5jYyktxuBwY0kDA==",
       "requires": {
         "jest-diff": "^26.0.0",
         "pretty-format": "^26.0.0"

explorer/package.json

@@ -16,7 +16,7 @@
     "@types/chai": "^4.2.15",
     "@types/chart.js": "^2.9.31",
     "@types/classnames": "^2.2.11",
-    "@types/jest": "^26.0.20",
+    "@types/jest": "^26.0.21",
     "@types/node": "^14.14.35",
     "@types/react": "^17.0.3",
     "@types/react-dom": "^17.0.2",