GHSA-R4PG-VG54-WXX4 cert-manager ha a potential slowdown / DoS when parsing specially crafted PEM inputs

Impact cert-manager packages which call the standard library pem.Decode function can take a long time to process specially crafted invalid PEM data. If an attacker is able to modify PEM data which cert-manager reads e.g. in a Secret resource, they may be able to use large amounts of CPU in the...