build(deps): bump dsa from 0.6.2 to 0.6.3 (#194)

Bumps [dsa](https://github.com/RustCrypto/signatures) from 0.6.2 to 0.6.3.
- [Commits](RustCrypto/signatures@dsa/v0.6.2...dsa/v0.6.3)

---
updated-dependencies:
- dependency-name: dsa
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]