ecdsa: bump `elliptic-curve` dependency to v0.12.0-pre.4 (RustCrypto#467

)

ecdsa v0.14.0-pre.4

ecdsa v0.14.0-pre.3 (RustCrypto#461)

build(deps): bump zeroize from 1.5.3 to 1.5.4 (RustCrypto#454)

Bumps [zeroize](https://github.com/RustCrypto/utils) from 1.5.3 to 1.5.4.
- [Release notes](https://github.com/RustCrypto/utils/releases)
- [Commits](RustCrypto/utils@zeroize-v1.5.3...zeroize-v1.5.4)

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

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

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

ecdsa v0.14.0-pre.2 (RustCrypto#453)

ed25519 v1.4.0 (RustCrypto#450)

ecdsa v0.14.0-pre.1 (RustCrypto#443)

rfc6979 v0.2.0-pre.0 (RustCrypto#437)

ecdsa v0.13.4 (RustCrypto#429)

ecdsa v0.13.3 (RustCrypto#420)