ostree-ext: update ostree rust bindings and use new feature

Author: jmarrero

Cargo.lock

@@ -11,7 +11,7 @@ version = "0.15.3"
 [dependencies]
 containers-image-proxy = "0.8.0"
 # We re-export this library too.
-ostree = { features = ["v2025_2"], version = "0.20" }
+ostree = { features = ["v2025_3"], version = "0.20" }
 
 # Private dependencies
 anyhow = { workspace = true }