release: prepare analytics 5.3.0

[tylerjroach]

No description provided.

[greptile-apps]

Confidence Score: 5/5

The release preparation appears safe to merge.

The package version, README release reference, and changelog entry consistently identify v5.3.0, and the build derives its version from the updated package constant.

Important Files Changed

Filename	Overview
CHANGELOG.md	Adds consistent release notes and comparison links for v5.3.0.
README.md	Updates the displayed latest release to v5.3.0.
mixpanel/init.py	Bumps the package's authoritative version to 5.3.0.

_{Reviews (1): Last reviewed commit: "release: prepare analytics 5.3.0" | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.25%. Comparing base (8dece95) to head (a8a9c56).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #186   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files          13       13           
  Lines        2616     2616           
  Branches      139      139           
=======================================
  Hits         2518     2518           
  Misses         64       64           
  Partials       34       34           

Flag	Coverage Δ
openfeature-provider	54.06% <100.00%> (ø)

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