Cherry-pick nbgl updates

[cedelavergne-ledger]

Description

Fix regression on Stax during long message review

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)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 59.89%. Comparing base (603cf09) to head (8262712).
Report is 50 commits behind head on API_LEVEL_21.

Files with missing lines	Patch %	Lines
lib_nbgl/src/nbgl_fonts.c	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           API_LEVEL_21     #765      +/-   ##
================================================
- Coverage         60.19%   59.89%   -0.31%     
================================================
  Files                12       12              
  Lines              1726     1723       -3     
================================================
- Hits               1039     1032       -7     
- Misses              687      691       +4     

Flag	Coverage Δ
unittests	59.89% <0.00%> (-0.31%)	⬇️

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