Mypy error changed

Update dev

Update contributing guide

Upload to PyPI with attestations

Add Klaviyo

Fix ignore

typing: remove pointless union

Deprecate better-exceptions integration (#802)

Build docs on 3.14 (#801)

Fix coverage

dev: use new-style tox versions

Drop 3.9 (#800)

dev: simplify by modernizing tox

Consistent endashes

update dev