chore(main): release 4.1.0

[LaunchDarklyReleaseBot]

:robot: I have created a release beep boop

4.1.0 (2024-02-15)

Features

• web based applications will now flush events before closing to ensure events are sent (#129) (c1e2828)

Bug Fixes

• backgrounded and offline apps no longer attempt to send events (#130) (f8244ab)

---

This PR was generated with Release Please. See documentation.

[LaunchDarklyReleaseBot]

:robot: Release is at https://github.com/launchdarkly/flutter-client-sdk/releases/tag/4.1.0 :sunflower: