chore(openfeature): pin mixpanel >=5.3.0 for FallbackReason (SDK-126)

[tylerjroach]

Summary

Follow-up to SDK-79. Now that openfeature-provider/src/mixpanel_openfeature/provider.py dereferences SelectedVariant.fallback_reason (_fallback_details), the mixpanel-openfeature PyPI package must not resolve against a base mixpanel version that predates that field, or every resolve_*_details call raises AttributeError.

Currently the wrapper's dep is mixpanel>=5.1.0,<6. Both published versions in that range (5.1.0, 5.2.0) predate #180's merge — so the wrapper is currently broken when installed against either.

Changes

• openfeature-provider/pyproject.toml: bump mixpanel>=5.1.0,<6 → mixpanel>=5.3.0,<6
• openfeature-provider/pyproject.toml: bump wrapper version 0.1.0 → 0.2.0 (new capability surface)

Merge sequencing

CI is expected to fail until mixpanel 5.3.0 is published with the SDK-79 changes. That failure is the point — it forces the correct release order:

1. Cut mixpanel 5.3.0 (containing fix(analytics): distinguish fallback reasons + forward backend error message (SDK-79, SDK-83) #180 / SDK-79)
2. Rebase/rebuild this PR — CI passes
3. Merge and publish mixpanel-openfeature 0.2.0

Same pattern as mixpanel/mixpanel-ruby#166 for Ruby.

Test plan

• Confirm CI fails now (5.3.0 not on PyPI yet — expected)
• Once mixpanel 5.3.0 is released, verify CI passes
• Verify installing mixpanel-openfeature==0.2.0 against mixpanel==5.2.0 raises a dependency-resolution error rather than a runtime AttributeError

Refs: SDK-126, SDK-79

🤖 Generated with Claude Code

[linear-code]

SDK-126

SDK-79

[greptile-apps]

Confidence Score: 5/5

This looks safe to merge after Mixpanel 5.3.0 is published.

• The new minimum version matches the API used by the provider.
• No blocking issues remain in the changed code.

Important Files Changed

Filename	Overview
openfeature-provider/pyproject.toml	Raises the minimum Mixpanel version to one that provides SelectedVariant.fallback_reason.

_{Reviews (2): Last reviewed commit: "Revert wrapper version bump — release-pr..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.81%. Comparing base (fa23251) to head (f2289f7).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
+ Coverage   95.98%   96.81%   +0.83%     
==========================================
  Files          13       13              
  Lines        2414     3202     +788     
  Branches      136      200      +64     
==========================================
+ Hits         2317     3100     +783     
- Misses         63       67       +4     
- Partials       34       35       +1     

Flag	Coverage Δ
openfeature-provider	54.06% <ø> (-0.66%)	⬇️

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