fix(stackable-versioned): add k8s-openapi as a dev-dependency

Author: NickLarsenNZ

crates/stackable-versioned-macros/Cargo.toml

@@ -45,6 +45,7 @@ quote.workspace = true
 [dev-dependencies]
 # Only needed for doc tests / examples
 stackable-versioned = { path = "../stackable-versioned", features = ["k8s"] }
+k8s-openapi = { workspace = true }
 
 insta.workspace = true
 prettyplease.workspace = true