Bump pygit2 from 1.11.1 to 1.12.0

Bumps pygit2 from 1.11.1 to 1.12.0.

Changelog

Sourced from pygit2's changelog.

1.12.0 (2023-04-01)

• Upgrade to libgit2 v1.6.3

• Update Linux wheels to bundle OpenSSL 3.0.8

• Downgrade Linux wheels to manylinux2014

• New ConflictCollection.__contains__ [#1181](https://github.com/libgit2/pygit2/issues/1181) <https://github.com/libgit2/pygit2/pull/1181>_

• New Repository.references.iterator(...) [#1191](https://github.com/libgit2/pygit2/issues/1191) <https://github.com/libgit2/pygit2/pull/1191>_

• New favor, flags and file_flags optional arguments for Repository.merge(...) [#1192](https://github.com/libgit2/pygit2/issues/1192) <https://github.com/libgit2/pygit2/pull/1192>_

• New keep_all and paths optional arguments for Repository.stash(...) [#1202](https://github.com/libgit2/pygit2/issues/1202) <https://github.com/libgit2/pygit2/pull/1202>_

• New Respository.state() [#1204](https://github.com/libgit2/pygit2/issues/1204) <https://github.com/libgit2/pygit2/pull/1204>_

• Improve Repository.write_archive(...) performance [#1183](https://github.com/libgit2/pygit2/issues/1183) <https://github.com/libgit2/pygit2/pull/1183>_

• Sync type annotations [#1203](https://github.com/libgit2/pygit2/issues/1203) <https://github.com/libgit2/pygit2/pull/1203>_

Commits

• acb4abb Release 1.12.0
• 741c2f0 Merge remote-tracking branch 'muhqu/revert-repository-hashfile'
• 8497755 Merge remote-tracking branch 'jorio/repository-state'
• 2f4082a Add Repository.state
• e97ed92 Sync type annotations
• 75f8fcd Add partial stash support (new in libgit2 1.6)
• cba4106 Update libgit2 opt init calls to non-deprecated versions
• 56355aa Downgrade to manylinux2014
• c54cced Upgrade to libgit2 1.6.3
• c8d6d27 Fix CI for pypy
• Additional commits viewable in compare view