chore(deps): bump oci-spec from 0.6.5 to 0.6.7

Bumps [oci-spec](https://github.com/containers/oci-spec-rs) from 0.6.5 to 0.6.7.
- [Release notes](https://github.com/containers/oci-spec-rs/releases)
- [Changelog](https://github.com/containers/oci-spec-rs/blob/main/release.md)
- [Commits](containers/oci-spec-rs@v0.6.5...v0.6.7)

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

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

containerd-shim-spin/Cargo.toml

@@ -36,7 +36,7 @@ serde = "1.0"
 serde_json = "1.0"
 url = "2.5"
 anyhow = "1.0"
-oci-spec = { version = "0.6.3" }
+oci-spec = { version = "0.6.7" }
 futures = "0.3"
 ctrlc = { version = "3.2", features = ["termination"] }