Bump browserify-sign from 4.0.4 to 4.2.5 (#108)

Bumps [browserify-sign](https://github.com/crypto-browserify/browserify-sign) from 4.0.4 to 4.2.5.
- [Changelog](https://github.com/browserify/browserify-sign/blob/main/CHANGELOG.md)
- [Commits](browserify/browserify-sign@v4.0.4...v4.2.5)

---
updated-dependencies:
- dependency-name: browserify-sign
  dependency-version: 4.2.5
  dependency-type: indirect
...

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Author: dependabot[bot]