Update API_LEVEL_21

[abonnaudet-ledger]

Description

Please provide a detailed description of what was done in this PR.
(And mention any links to an issue docs)

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it.

Additional comments

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 35.67%. Comparing base (603cf09) to head (cbf19c3).
Report is 53 commits behind head on API_LEVEL_21.

Files with missing lines	Patch %	Lines
lib_ux_sync/src/ux_sync.c	57.14%	3 Missing ⚠️
lib_nbgl/src/nbgl_screen.c	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           API_LEVEL_21     #778       +/-   ##
=================================================
- Coverage         60.19%   35.67%   -24.53%     
=================================================
  Files                12       13        +1     
  Lines              1726     1595      -131     
=================================================
- Hits               1039      569      -470     
- Misses              687     1026      +339     

Flag	Coverage Δ
unittests	35.67% <44.44%> (-24.53%)	⬇️

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