fix: downgrade amplify-android to 1.33.0

[haverchuck]

Description of changes:
downgrade amplify-android to 1.33.0

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[HuiSF]

LGTM.
PR probably needs rebase.

[codecov-commenter]

Codecov Report

Merging #1591 (42a29c8) into main (966d9ed) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1591      +/-   ##
==========================================
- Coverage   46.17%   46.14%   -0.03%     
==========================================
  Files         260      260              
  Lines       10237    10230       -7     
==========================================
- Hits         4727     4721       -6     
+ Misses       5510     5509       -1     

Flag	Coverage Δ
android-unit-tests	∅ <ø> (∅)
flutter-unit-tests	36.65% <100.00%> (-0.05%)	⬇️
ios-unit-tests	83.57% <ø> (ø)

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Impacted Files	Coverage Δ
...r/lib/src/mixins/authenticator_username_field.dart	56.58% <100.00%> (-0.77%)	⬇️
...thenticator/lib/src/state/authenticator_state.dart	6.35% <0.00%> (-0.43%)	⬇️