print/latex-biber: Update to 2.20

Now that TeX Live 2025 is in the ports, LaTeX Biber must also be adapted
to BibLaTeX version 3.20.

Changes:

• Added new option settings minyearinit and minyearfull for uniquename
• Added \DeclareNamehashTemplate and supporting macros to allow customisation of the nameparts used in name hash construction.
• Added facility for custom namehash ids in extended name format.
• Added new field fullhashraw.
• Misc bug fixes

PR: 286175
MFH: 2025Q2