launchdarkly-server-sdk 7.3.1 on Python PyPI

[7.3.1] - 2022-02-14

CI builds now include a cross-platform test suite implemented in https://github.com/launchdarkly/sdk-test-harness. This covers many test cases that are also implemented in unit tests, but may be extended in the future to ensure consistent behavior across SDKs in other areas.

The SDK no longer uses the deprecated method threading.Condition.notifyAll(). (Thanks, jdmoldenhauer!)
A rule clause that uses a date operator should be considered a non-match, rather than an error, if either value is None.
A rule clause that uses a semver operator should be considered a non-match, rather than an error, if either value is not a string.
Rules targeting the secondary attribute will now reference the correct value.
The identify method should not emit an event if the user key is an empty string.
Do not include prereqOf field in event data if it is null. This is done to save on event transfer bandwidth.
Data from all_flags_state was always including the flag's version even when it was unnecessary.
Any base URIs set in Config will work consistently whether they have trailing slashes or not.
When using all_flags_state to produce bootstrap data for the JavaScript SDK, the Python SDK was not returning the correct metadata for evaluations that involved an experiment. As a result, the analytics events produced by the JavaScript SDK did not correctly reflect experimentation results.
Data from all_flags_state was always including the flag's version even when it was unnecessary.