devel/py-hvac: Update to 0.10.8

• K8s Auth: Allow wildcards for service account and namespace
• Add token_type support to create_kubernetes_role

Changelog: https://github.com/hvac/hvac/releases/tag/v0.10.8

PR: 253368
Submitted by: Alessandro Sagratini <ale_sagra@hotmail.com> (maintainer)
Approved by: arrowd, tcberner (mentors, implicit)