[release] 0.53.0 - Network request refactor and improved unit test (#387)

### Improvements
  - refactored network request to consolidate exception paths
  ### Fixes
- fix a bug in network fallback unit test where status code was not
reset between tests, causing the unit test to be inaccurate





>Included In This Release
>- 4c4efad kat-statsig
>   - return unsuccess for local mode (#386)
>- b319918 kat-statsig
>   - network request + unit test refactor (#384)

Author: kat-statsig

statsig/version.py

@@ -1 +1 @@
-__version__ = '0.52.0'
+__version__ = '0.53.0'