Release v1.19 (legacy)

What's Changed

• Fix release type for github workflows, switch to new auth by @SlouchyButton in #146
• Add setuptools dependency to requirements.txt by @SlouchyButton in #147
• Add id-token permission for trusted publishing by @SlouchyButton in #148
• Drop the dependency on six by @praiskup in #150
• Fix support for automatic manpage generation by @praiskup in #154

Full Changelog: v1.18...v1.19

This release uses older build approach to support old Python version (before 3.9)