Bump bn.js from 4.12.0 to 5.2.1

Bumps [bn.js](https://github.com/indutny/bn.js) from 4.12.0 to 5.2.1.
- [Release notes](https://github.com/indutny/bn.js/releases)
- [Changelog](https://github.com/indutny/bn.js/blob/master/CHANGELOG.md)
- [Commits](indutny/bn.js@v4.12.0...v5.2.1)

---
updated-dependencies:
- dependency-name: bn.js
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -17,7 +17,7 @@
     "@rsksmart/btc-rsk-derivation": "^0.0.2",
     "@rsksmart/pmt-builder": "^3.0.0",
     "@rsksmart/powpeg-redeemscript-parser": "^1.0.0",
-    "bn.js": "^4.11.8",
+    "bn.js": "^5.2.1",
     "bridge-transaction-parser-hop400": "github:rsksmart/bridge-transaction-parser#v0.4.0-beta",
     "bridge-transaction-parser-fingerroot500": "github:rsksmart/bridge-transaction-parser#v0.5.0-beta",
     "bridge-transaction-parser-lovell700": "git+https://github.com/rsksmart/bridge-transaction-parser#master",