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