build(deps): bump crypto-bigint from 0.7.1 to 0.7.3

Bumps [crypto-bigint](https://github.com/RustCrypto/crypto-bigint) from 0.7.1 to 0.7.3.
- [Changelog](https://github.com/RustCrypto/crypto-bigint/blob/master/CHANGELOG.md)
- [Commits](RustCrypto/crypto-bigint@v0.7.1...v0.7.3)

---
updated-dependencies:
- dependency-name: crypto-bigint
  dependency-version: 0.7.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]