fix(deps): update dependency pygit2 to >=1.19.3,<1.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pygit2 (changelog)	>=1.12.0,<1.19 → >=1.19.3,<1.20

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Release Notes

libgit2/pygit2 (pygit2)

v1.19.3

Compare Source

• Memory fixes
  #​1368
  #​1417
  #​1443

• Fix Repository.ident
  #​1461

• Build/CI fixes and updates
  #​1454
  #​1459

• Documentation and annotation fixes
  #​410
  #​1289
  #​1323
  #​1333
  #​1458
  #​1460

• Add AGENTS.md file generated by Kimi-k2.6

v1.19.2

Compare Source

• Fix refcount and error handling issues in filter_register(...)

• Fix config with valueless keys
  #​1457

• New Repository.load_filter_list(...) and FilterList
  #​1444

• New Odb.read_header(...) and now Odb.read(...) returns enums.ObjectType instead of int
  #​1450

• Build and CI fixes
  #​1446
  #​1448
  #​1455

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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[gabe-l-hart]

@HonakerM It looks like we've hit a compatibility wall with pygit2. I'm sure this is super low on your TODO list, but if you get a chance, it would be great for you to take a look at what doesn't work in the newer versions.