bump bn.js from 4.12.2 to 4.12.3 (#7073)

* Bump bn.js from 4.12.2 to 4.12.3

Bumps [bn.js](https://github.com/indutny/bn.js) from 4.12.2 to 4.12.3.
- [Release notes](https://github.com/indutny/bn.js/releases)
- [Changelog](https://github.com/indutny/bn.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/indutny/bn.js/compare/v4.12.2...v4.12.3)

---
updated-dependencies:
- dependency-name: bn.js
  dependency-version: 4.12.3
  dependency-type: indirect
...

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

* note

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matt Fiddaman <github@m.fiddaman.uk>

upcoming-release-notes/7073.md

@@ -0,0 +1,6 @@
+---
+category: Maintenance
+authors: [matt-fidd]
+---
+
+Bump bn.js dependency

yarn.lock

@@ -11651,9 +11651,9 @@ __metadata:
   linkType: hard
 
 "bn.js@npm:^4.0.0, bn.js@npm:^4.1.0, bn.js@npm:^4.11.9":
-  version: 4.12.2
-  resolution: "bn.js@npm:4.12.2"
-  checksum: 10/5803983405c087443e0e6c9bb5d0bc863d9f987d77e710f81b14c55616494f5a274e1650ee892531acb3529d52c0e0ea48aa12d2873dd80a75dde9d73a2ec518
+  version: 4.12.3
+  resolution: "bn.js@npm:4.12.3"
+  checksum: 10/57ed5a055f946f3e009f1589c45a5242db07f3dddfc72e4506f0dd9d8b145f0dbee4edabc2499288f3fc338eb712fb96a1c623a2ed2bcd49781df1a64db64dd1
   languageName: node
   linkType: hard