chore(deps): bump bn.js from 4.12.0 to 4.12.3 (#1793)

Bumps [bn.js](https://github.com/indutny/bn.js) from 4.12.0 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](indutny/bn.js@v4.12.0...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

yarn.lock

@@ -5029,14 +5029,14 @@ bl@^4.1.0:
     readable-stream "^3.4.0"
 
 bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.11.9:
-  version "4.12.0"
-  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.12.0.tgz#775b3f278efbb9718eec7361f483fb36fbbfea88"
-  integrity sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA==
+  version "4.12.3"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.12.3.tgz#2cc2c679188eb35b006f2d0d4710bed8437a769e"
+  integrity sha512-fGTi3gxV/23FTYdAoUtLYp6qySe2KE3teyZitipKNRuVYcBkoP/bB3guXN/XVKUe9mxCHXnc9C4ocyz8OmgN0g==
 
 bn.js@^5.0.0, bn.js@^5.2.1:
-  version "5.2.1"
-  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.2.1.tgz#0bc527a6a0d18d0aa8d5b0538ce4a77dccfa7b70"
-  integrity sha512-eXRvHzWyYPBuB4NBy0cmYQjGitUrtqwbvlzP3G6VFnNRbsZQIxQ10PbKKHt8gZ/HW/D/747aDl+QkDqg3KQLMQ==
+  version "5.2.3"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.2.3.tgz#16a9e409616b23fef3ccbedb8d42f13bff80295e"
+  integrity sha512-EAcmnPkxpntVL+DS7bO1zhcZNvCkxqtkd0ZY53h06GNQ3DEkkGZ/gKgmDv6DdZQGj9BgfSPKtJJ7Dp1GPP8f7w==
 
 body-parser@^2.2.1:
   version "2.2.2"