Flutter 3.13.0

[matthiasn]

This PR upgrade Flutter to 3.13.0, fixes new style issues, and upgraded the dependencies.

[codecov]

Codecov Report

Merging #1637 (ad30697) into main (d4aa66f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1637   +/-   ##
=======================================
  Coverage   70.21%   70.21%           
=======================================
  Files         269      269           
  Lines       10974    10974           
=======================================
  Hits         7705     7705           
  Misses       3269     3269           

Files Changed	Coverage Δ
lib/database/sync_db.dart	72.91% <ø> (ø)
...ges/settings/categories/category_details_page.dart	97.53% <ø> (ø)
...settings/dashboards/dashboard_definition_page.dart	74.80% <ø> (ø)
lib/pages/settings/definitions_list_page.dart	89.13% <ø> (ø)
lib/pages/settings/habits/habit_details_page.dart	100.00% <ø> (ø)
.../settings/measurables/measurable_details_page.dart	100.00% <ø> (ø)
lib/pages/settings/sliver_box_adapter_page.dart	100.00% <ø> (ø)
lib/pages/settings/sync/sync_assistant_page.dart	1.14% <ø> (ø)
...es/settings/sync/sync_assistant_slide_qr_code.dart	0.00% <ø> (ø)
lib/widgets/app_bar/title_app_bar.dart	84.61% <ø> (ø)
... and 22 more

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