Bump browserify-sign from 4.2.0 to 4.2.1 (#14636)
Bump browserify-sign from 4.2.0 to 4.2.1 (#14636)

Bumps [browserify-sign](https://github.com/crypto-browserify/browserify-sign) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/crypto-browserify/browserify-sign/releases)
- [Commits](https://github.com/crypto-browserify/browserify-sign/compare/v4.2.0...v4.2.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
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