build: bump serde-big-array from 0.4.1 to 0.5.0

Bumps [serde-big-array](https://github.com/est31/serde-big-array) from 0.4.1 to 0.5.0.
- [Release notes](https://github.com/est31/serde-big-array/releases)
- [Commits](est31/serde-big-array@v0.4.1...v0.5.0)

---
updated-dependencies:
- dependency-name: serde-big-array
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

implementations/rust/ockam/ockam_identity/Cargo.toml

@@ -75,7 +75,7 @@ heapless = "0.7"
 serde = { version = "1.0", default-features = false, features = ["derive"] }
 serde_json = { version = "1.0", optional = true }
 sha2 = { version = "0.10", default-features = false }
-serde-big-array = "0.4"
+serde-big-array = "0.5"
 subtle = { version = "2.4.1", default-features = false }
 rand = { version = "0.8", default-features = false }
 tracing = { version = "0.1", default_features = false }