Update to pdfium 6281 and implement FPDFText_LoadCidType2Font

[jerbob92]

No description provided.

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (4cecdc1) 75.62% compared to head (a1488d4) 75.61%.

Files	Patch %	Lines
internal/implementation_webassembly/fpdf_edit.go	63.41%	10 Missing and 5 partials ⚠️
...ernal/implementation_cgo/fpdf_edit_experimental.go	85.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
- Coverage   75.62%   75.61%   -0.02%     
==========================================
  Files         110      110              
  Lines       24609    24670      +61     
==========================================
+ Hits        18611    18654      +43     
- Misses       4231     4243      +12     
- Partials     1767     1773       +6     

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