devel/py-hvac: Update to 1.1.1

• Switch to DISTVERSION
• Switch to pep517 build
• Remove test target because PYPI tarball doesn't include tests: https://github.com/hvac/hvac/issues/1011

ChangeLog: https://github.com/hvac/hvac/blob/v1.1.1/CHANGELOG.md
PR: 272060