Update for Flutter 3.22

[tomgilder]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.40%. Comparing base (620e070) to head (21bb2ed).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #333   +/-   ##
=======================================
  Coverage   99.40%   99.40%           
=======================================
  Files          20       20           
  Lines        1005     1005           
=======================================
  Hits          999      999           
  Misses          6        6           

Files	Coverage Δ
lib/src/route_data.dart	100.00% <100.00%> (ø)

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[killik-dan-stubbs]

Looks great, defo appreciate the update in the pubspec and the update to the minimum dart version.