chore(deps): Bump dsa from 0.6.2 to 0.6.3

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: indirect
  update-type: version-update:semver-patch
...

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