Update pdfium to 6721

[jerbob92]

• Update PDFium to 6721 (including new WASM build using Emscripten 3.1.72)
• Removed experimental methods:
  • FPDFFont_GetFontName (now FPDFFont_GetBaseFontName and FPDFFont_GetFamilyName)
  • FPDFText_GetTextRenderMode (use FPDFText_GetTextObject and FPDFTextObj_GetTextRenderMode now)
• Implemented new experimental methods:
  • FPDFAnnot_GetFontColor
  • FPDF_StructElement_Attr_GetValue
  • FPDF_StructElement_Attr_GetChildAtIndex
  • FPDF_StructElement_Attr_CountChildren
  • FPDFText_GetTextObject
  • FPDFFont_GetBaseFontName
  • FPDFFont_GetFamilyName
  • FPDFCatalog_SetLanguage
  • FPDFPageObj_TransformF
  • FPDFPageObj_GetMarkedContentID
• Change working of structtree functions:
  • FPDF_StructElement_Attr_GetType now expects a FPDF_STRUCTELEMENT_ATTR_VALUE (fetched using FPDF_StructElement_Attr_GetValue)
  • FPDF_StructElement_Attr_GetBooleanValue now expects a FPDF_STRUCTELEMENT_ATTR_VALUE (fetched using FPDF_StructElement_Attr_GetValue)
  • FPDF_StructElement_Attr_GetNumberValue now expects a FPDF_STRUCTELEMENT_ATTR_VALUE (fetched using FPDF_StructElement_Attr_GetValue)
  • FPDF_StructElement_Attr_GetStringValue now expects a FPDF_STRUCTELEMENT_ATTR_VALUE (fetched using FPDF_StructElement_Attr_GetValue)
  • FPDF_StructElement_Attr_GetBlobValue now expects a FPDF_STRUCTELEMENT_ATTR_VALUE (fetched using FPDF_StructElement_Attr_GetValue)

[codecov]

Codecov Report

Attention: Patch coverage is 81.71642% with 98 lines in your changes missing coverage. Please review.

Project coverage is 75.57%. Comparing base (8c3d896) to head (b25152c).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/implementation_webassembly/fpdf_edit.go	65.82%	18 Missing and 9 partials ⚠️
internal/implementation_webassembly/fpdf_annot.go	56.36%	16 Missing and 8 partials ⚠️
...rnal/implementation_webassembly/fpdf_structtree.go	79.45%	10 Missing and 5 partials ⚠️
...nternal/implementation_webassembly/fpdf_catalog.go	60.86%	6 Missing and 3 partials ⚠️
...ernal/implementation_cgo/fpdf_edit_experimental.go	89.47%	4 Missing and 2 partials ⚠️
...implementation_cgo/fpdf_structtree_experimental.go	90.16%	4 Missing and 2 partials ⚠️
internal/implementation_cgo/fpdf_annot.go	88.00%	2 Missing and 1 partial ⚠️
internal/implementation_cgo/fpdf_catalog.go	81.25%	2 Missing and 1 partial ⚠️
internal/implementation_webassembly/fpdf_text.go	86.36%	2 Missing and 1 partial ⚠️
internal/implementation_cgo/implementation.go	97.61%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   75.63%   75.57%   -0.07%     
==========================================
  Files         110      110              
  Lines       24784    25156     +372     
==========================================
+ Hits        18746    19011     +265     
- Misses       4257     4329      +72     
- Partials     1781     1816      +35     

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