changed the flutter version

[4555jan]

Addressed Issues:

Fixes #45

Screenshots/Recordings:

N/A — CI workflow change only

Additional Notes:

Updated Flutter version in pr_check.yml from 3.22.0 to 3.44.2 to match the Dart SDK constraint (^3.9.2) specified in pubspec.yaml. Flutter 3.44.2 bundles Dart 3.9.x which satisfies the requirement.

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[4555jan]

@M4dhav please review it