chore(deps): bump oci-spec from 0.6.8 to 0.7.1

Bumps [oci-spec](https://github.com/containers/oci-spec-rs) from 0.6.8 to 0.7.1.
- [Release notes](https://github.com/containers/oci-spec-rs/releases)
- [Changelog](https://github.com/youki-dev/oci-spec-rs/blob/main/release.md)
- [Commits](youki-dev/oci-spec-rs@v0.6.8...v0.7.1)

---
updated-dependencies:
- dependency-name: oci-spec
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -35,7 +35,7 @@ libc = "0.2.168"
 libcontainer = { version = "0.4.1", default-features = false }
 log = "0.4"
 nix = "0.29"
-oci-spec = { version = "0.6.8", features = ["runtime"] }
+oci-spec = { version = "0.7.0", features = ["runtime"] }
 protobuf = "=3.2"
 serde = "1.0"
 serde_json = "1.0"