chore(main): release launchdarkly_dart_common 1.2.0

[LaunchDarklyReleaseBot]

:robot: I have created a release beep boop

1.2.0 (2024-03-14)

Features

• Always inline contexts for feature events (#76) (b2ebcbf)
• Redact anonymous attributes within feature events (#77) (4387375)

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[LaunchDarklyReleaseBot]

:robot: Release is at https://github.com/launchdarkly/flutter-client-sdk/releases/tag/launchdarkly_dart_common-v1.2.0 :sunflower: