[BUG]: update package_config to v3

[Carapacik]

Is there an existing issue for this?

• I have searched the existing issues

Version

No response

Command type

build_runner (Default)

What happened?

Because flutter_gen_runner 5.15.0 depends on package_config ^2.1.0 and no versions of flutter_gen_runner match >5.15.0 <6.0.0, flutter_gen_runner ^5.15.0 requires package_config ^2.1.0.
So, because p depends on both package_config 3.0.0 and flutter_gen_runner ^5.15.0, version solving failed.
Failed to update packages.

Relevant a pubspec.yaml.

Relevant log output

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