chore(deps): update dependency pygit2 to v1.19.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pygit2 (changelog)	==1.18.2 → ==1.19.1

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Release Notes

libgit2/pygit2 (pygit2)

v1.19.1

Compare Source

• Update wheels to libgit2 1.9.2 and OpenSSL 3.5

• Fix: now diff's getitem/iter returns None for unchanged or binary files
  #​1412

• CI (macOS): arm, intel and pypy wheels (instead of universal)
  #​1441

• CI (pypy): fix tests
  #​1437

v1.19.0

Compare Source

• Add support for Python 3.14 and drop 3.10

• Support threaded builds (experimental)
  #​1430
  #​1435

• Add Linux musl wheels for AArch64

• Add Windows wheels for AArch64;
  CI: build Windows wheels with cibuildwheel on GitHub
  #​1423

• New Repository.transaction() context manager, returns new ReferenceTransaction
  #​1420

• CI: add GitHub releases and other improvements
  #​1433
  #​1432
  #​1425
  #​1431

• Documentation improvements and other changes
  #​1426
  #​1424

Breaking changes:

• Remove deprecated IndexEntry.hex, use str(entry.id) instead of entry.hex

Deprecations:

• Deprecate IndexEntry.oid, use entry.id instead of entry.oid

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