When is it compatible with the latest version of flutter

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The current Dart SDK version is 3.0.2.

Because xterm <2.0.0-pre doesn't support null safety and xterm >=2.0.0-pre <2.6.0 depends on platform_info ^3.0.0-nullsafety.1, xterm <2.6.0
requires platform_info ^3.0.0-nullsafety.1. And because xterm >=2.6.0 depends on platform_info ^3.0.0, every version of xterm requires platform_info ^3.0.0-nullsafety.1. So, because web_flutter depends on both platform_info ^4.0.2 and xterm any, version solving failed.

The lower bound of "sdk: '>=2.7.0 <3.0.0'" must be 2.12.0 or higher to enable null safety. For details, see https://dart.dev/null-safety