1.24.0

feat: bump version for session length maximum (#407)

* make session id recycle after 24 hours

* less pythony variables in test

* add the start time if the client doesn't already have it

* put session start time at end of storage so you can rollback if needed

* add tests that show that clock moving forward by 24 hours resets session id

* and a test for inactivity threshold

* bump posthog-js version