Update sunsetted Flutter SDK versions

[helin24]

The general rules are:

• SDKs that are 2 years old should no longer be supported
• SDKs that are 3 months away from not being supported should get a warning.

[gemini-code-assist]

Code Review

This pull request updates the minimum supported Flutter SDK version to 3.19.4 and the version without sunset warnings to 3.22.2, along with corresponding updates to the unit tests. Feedback was provided regarding an unrelated change to the Java bytecode target level in the project configuration, which should be reverted to version 17 to maintain build compatibility and avoid unexpected failures for other developers.

[pq]

I have to wonder about automation here. Or maybe an issue for a bi-annual (or similar cadence) check?

@helin24: out of curiosity, what prompted you to do the update?

[pq]

💎

Nice!

[helin24]

I have to wonder about automation here. Or maybe an issue for a bi-annual (or similar cadence) check?

@helin24: out of curiosity, what prompted you to do the update?

Yes, I feel like this could go into a skill (or sub-skill?) related to preparing the plugin for release. That's why I was checking - I just want users to get the appropriate sunset warning on time.