bump bn.js from 4.12.0 to 4.12.5 in /scripts

Bumps [bn.js](https://github.com/indutny/bn.js) from 4.12.0 to 4.12.5.
- [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...v4.12.5)

---
updated-dependencies:
- dependency-name: bn.js
  dependency-version: 4.12.5
  dependency-type: indirect
...

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

Author: dependabot[bot]

scripts/yarn.lock

@@ -1542,14 +1542,14 @@ blakejs@^1.1.0:
   integrity sha512-QXUSXI3QVc/gJME0dBpXrag1kbzOqCjCX8/b54ntNyW6sjtoqxqRk3LTmXzaJoh71zMsDCjM+47jS7XiwN/+fQ==
 
 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 "4.12.5"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-4.12.5.tgz#74f119ffecd823168d188eae06d97ea40835c489"
+  integrity sha512-3aRg6/JxfffFD+OlOjOFR3Vo79l39ooBTFucxx+MT3dhCtzn3EmiUPQo+6/OZuI2jbXi3YKgmiTFBgChQMwIRQ==
 
 bn.js@^5.1.2, bn.js@^5.2.0, 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 "5.2.5"
+  resolved "https://registry.yarnpkg.com/bn.js/-/bn.js-5.2.5.tgz#e81ce41cf25e6f0cd1e05f20a9db8c18405e375f"
+  integrity sha512-Vq886eXykuP5E6HcKSSStP3bJgrE6In5WKxVUvJ8XGpWWYs2xZHWqUwzCtGgEtBcxyd57KBFDPFoUfNzdaHCNg==
 
 boolbase@^1.0.0:
   version "1.0.0"