fix: float arguments in host function parameters (#39)

fix: float arguments in host function parameters (#39)

fix: upgrade deprecated GitHub Actions to v4/v5 (#40)

## Summary
- Upgrades `actions/upload-artifact` and `actions/download-artifact`
from v3 to v4 (v3 is deprecated and now fails)
- Bumps `actions/checkout` from v3 to v4 and `actions/setup-python` from
v4 to v5

## Test plan
- [ ] Verify the `build.yaml` workflow runs successfully on push to main
or tag push

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <[email protected]>

fix: improve error handling (#24)

Updates `call` to raise an error when the plugin error is set and the
plugin returns 0

Related to #23

Update readme for 1.0 (#20)

feat: make it possible to add custom logging handler (#18)

Support for extism/extism#578

Update to `extism_sys==^1.0.0-rc7`

---------

Co-authored-by: Chris Dickinson <[email protected]>