Release 0.4.0

What's Changed

• cli: add a flag for disabling ambient OIDC detection by @woodruffw in #68
• build: move almost everything to pyproject.toml by @woodruffw in #70
• Support configurable OIDC issuers by @tetsuo-cpp in #62
• cli, verify: refactor, add logging by @woodruffw in #71
• fulcio, _sign: Request certificates via CSR by @tetsuo-cpp in #74
• Revert "fulcio, _sign: Request certificates via CSR (#74)" by @woodruffw in #75
• Update gitignore by @di in #76
• pyproject: pin pyjwt>=2.1 by @woodruffw in #77
• version: 0.4.0 by @woodruffw in #78

Full Changelog: v0.3.1...v0.4.0