yaml_load should not be B5xx cryptography group

Describe the bug The yaml_load plugin has bandit ID B506. The 5xx group according to [1] is defined as the group for cryptography. This plugin would be more appropriate as a type of injection B6xx

To Reproduce n/a

Expected behavior n/a

Bandit version

bandit 1.4.0

Additional context Add any other context about the problem here.