chore: require Python 3.10 to align with latest OpenFeature and LaunchDarkly SDKs

[devin-ai-integration]

Summary

This example app declared python = "^3.9", which silently held it back to old transitive SDK versions. Both openfeature-sdk 0.10.0 and launchdarkly-server-sdk 9.16.1 declare requires_python >= 3.10, so Poetry had to resolve downwards to satisfy the 3.9 floor:

# before  (python = "^3.9")
openfeature-sdk          0.8.4     <- not latest
launchdarkly-server-sdk  9.14.1    <- not latest

# after   (python = "^3.10")
openfeature-sdk          0.10.0
launchdarkly-server-sdk  9.16.1

The provider this app demonstrates (openfeature-python-server) already requires python = "^3.10", so the ^3.9 floor here was inconsistent with the library it exists to showcase. Python 3.9 is also past end-of-life.

.github/workflows/ci.yml pinned python-version: 3.9, which would now fail dependency resolution, so it moves to '3.10' (quoted so YAML doesn't parse it as the float 3.1).

How to test

poetry install
LAUNCHDARKLY_SDK_KEY=<server key> LAUNCHDARKLY_FLAG_KEY=sample-feature poetry run python main.py

Verified locally: poetry install now resolves OpenFeature 0.10.0 + LaunchDarkly 9.16.1, and main.py connects to LaunchDarkly and evaluates the flag through the provider successfully.

Risks / limitations

Anyone running this example on Python 3.9 will need to upgrade to 3.10+. That is unavoidable — the current SDK releases do not support 3.9.

Link to Devin session: https://app.devin.ai/sessions/62983b2a41614cf2a9e97f2760512fe1

---

Note

Low Risk
Version and CI pin changes only; the main operational note is that anyone still on Python 3.9 must upgrade to run the example.

Overview
Raises the example app’s Python floor from 3.9 to 3.10 in pyproject.toml (python = "^3.10"), aligning with the OpenFeature/LaunchDarkly stacks that no longer support 3.9 and allowing Poetry to pull current SDK releases instead of older transitive pins.

CI is updated to match: .github/workflows/ci.yml now installs Python '3.10' (quoted) instead of 3.9, so poetry install in the workflow succeeds under the new constraint.

^{Reviewed by Cursor Bugbot for commit eb11875. Bugbot is set up for automated code reviews on this repo. Configure here.}

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment, CI, and merge conflict monitoring