Update cyclonedx-bom requirement from 0.7.0 to 0.8.0

Updates the requirements on [cyclonedx-bom](https://github.com/CycloneDX/cyclonedx-rust-cargo) to permit the latest version.
- [Release notes](https://github.com/CycloneDX/cyclonedx-rust-cargo/releases)
- [Commits](CycloneDX/cyclonedx-rust-cargo@cyclonedx-bom-0.7.0...cyclonedx-bom-0.8.0)

---
updated-dependencies:
- dependency-name: cyclonedx-bom
  dependency-type: direct:production
...

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

libcnb/Cargo.toml

@@ -19,7 +19,7 @@ trace = ["dep:opentelemetry", "dep:opentelemetry_sdk", "dep:opentelemetry-stdout
 
 [dependencies]
 anyhow = { version = "1.0.91", optional = true }
-cyclonedx-bom = { version = "0.7.0", optional = true }
+cyclonedx-bom = { version = "0.8.0", optional = true }
 libcnb-common.workspace = true
 libcnb-data.workspace = true
 libcnb-proc-macros.workspace = true