Bump k256 from 0.10.2 to 0.10.4 (paritytech#11249)

Bumps [k256](https://github.com/RustCrypto/elliptic-curves) from 0.10.2 to 0.10.4.
- [Release notes](https://github.com/RustCrypto/elliptic-curves/releases)
- [Commits](RustCrypto/elliptic-curves@k256/v0.10.2...k256/v0.10.4)

---
updated-dependencies:
- dependency-name: k256
  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]

Cargo.lock

@@ -35,7 +35,7 @@ impl-trait-for-tuples = "0.2.2"
 smallvec = "1.8.0"
 log = { version = "0.4.16", default-features = false }
 sp-core-hashing-proc-macro = { version = "5.0.0", path = "../../primitives/core/hashing/proc-macro" }
-k256 = { version = "0.10.2", default-features = false, features = ["ecdsa"] }
+k256 = { version = "0.10.4", default-features = false, features = ["ecdsa"] }
 
 [dev-dependencies]
 assert_matches = "1.3.0"