Chore(deps): Update kube-cel requirement from 0.7.0 to 0.8.0

Updates the requirements on [kube-cel](https://github.com/kube-rs/kube-cel) to permit the latest version.
- [Release notes](https://github.com/kube-rs/kube-cel/releases)
- [Changelog](https://github.com/kube-rs/kube-cel/blob/main/CHANGELOG.md)
- [Commits](kube-rs/kube-cel@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: kube-cel
  dependency-version: 0.8.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

kube-core/Cargo.toml

@@ -38,7 +38,7 @@ schemars = { workspace = true, optional = true }
 k8s-openapi.workspace = true
 serde-value.workspace = true
 derive_more = { workspace = true, features = ["from"] }
-kube-cel = { version = "0.7.0", optional = true, features = ["validation"] }
+kube-cel = { version = "0.8.0", optional = true, features = ["validation"] }
 
 [dev-dependencies]
 k8s-openapi = { workspace = true, features = ["latest"] }