chore:(deps): bump @types/bn.js from 4.11.6 to 5.1.0 in /explorer (#14666)

Bumps [@types/bn.js](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/bn.js) from 4.11.6 to 5.1.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/bn.js)

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

explorer/package-lock.json

@@ -3101,9 +3101,9 @@
       }
     },
     "@types/bn.js": {
-      "version": "4.11.6",
-      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.6.tgz",
-      "integrity": "sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.0.tgz",
+      "integrity": "sha512-QSSVYj7pYFN49kW77o2s9xTCwZ8F2xLbjLLSEVh8D2F4JUhZtPAGOFLTD+ffqksBx/u4cE/KImFjyhqCjn/LIA==",
       "requires": {
         "@types/node": "*"
       }

explorer/package.json

@@ -10,7 +10,7 @@
     "@testing-library/jest-dom": "^5.11.9",
     "@testing-library/react": "^11.2.2",
     "@testing-library/user-event": "^12.6.0",
-    "@types/bn.js": "^4.11.6",
+    "@types/bn.js": "^5.1.0",
     "@types/bs58": "^4.0.1",
     "@types/chai": "^4.2.14",
     "@types/chart.js": "^2.9.29",