chore:(deps): bump @types/chart.js from 2.9.27 to 2.9.28 in /explorer (#13641)

Bumps [@types/chart.js](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/chart.js) from 2.9.27 to 2.9.28.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/chart.js)

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

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

explorer/package-lock.json

@@ -2666,9 +2666,9 @@
       "integrity": "sha512-G+ITQPXkwTrslfG5L/BksmbLUA0M1iybEsmCWPqzSxsRRhJZimBKJkoMi8fr/CPygPTj4zO5pJH7I2/cm9M7SQ=="
     },
     "@types/chart.js": {
-      "version": "2.9.27",
-      "resolved": "https://registry.npmjs.org/@types/chart.js/-/chart.js-2.9.27.tgz",
-      "integrity": "sha512-b3ho2RpPLWzLzOXKkFwpvlRDEVWQrCknu2/p90mLY5v2DO8owk0OwWkv4MqAC91kJL52bQGXkVw/De+N/0/1+A==",
+      "version": "2.9.28",
+      "resolved": "https://registry.npmjs.org/@types/chart.js/-/chart.js-2.9.28.tgz",
+      "integrity": "sha512-9YYhsxRngRJb0dkuaU5BezkF+zvvVHnwdRw+rtlahtFb4zqNf9YSgWsOq+dLYeh0fqsWmHUYLR64eNigh02F+w==",
       "requires": {
         "moment": "^2.10.2"
       }

explorer/package.json

@@ -13,7 +13,7 @@
     "@types/bn.js": "^4.11.6",
     "@types/bs58": "^4.0.1",
     "@types/chai": "^4.2.14",
-    "@types/chart.js": "^2.9.27",
+    "@types/chart.js": "^2.9.28",
     "@types/classnames": "^2.2.11",
     "@types/jest": "^26.0.15",
     "@types/node": "^14.14.7",