GHSA-39vw-qp34-rmwf Uncontrolled recursion leads to abort in deserialization

• crates.io serde_yaml: >= 0.6.0-rc1, < 0.8.4 → fixed in 0.8.4

Affected versions of this crate did not properly check for recursion while deserializing aliases. This allows an attacker to make a YAML file with an alias referring to itself causing an abort. The flaw was corrected by checking the recursion depth.