Bump pygit2 from 1.11.1 to 1.12.1

Bumps pygit2 from 1.11.1 to 1.12.1.

Changelog

Sourced from pygit2's changelog.

1.12.1 (2023-05-07)

• Fix segfault in signature when encoding is incorrect [#1210](https://github.com/libgit2/pygit2/issues/1210) <https://github.com/libgit2/pygit2/pull/1210>_

• Typing improvements [#1212](https://github.com/libgit2/pygit2/issues/1212) <https://github.com/libgit2/pygit2/pull/1212>_ [#1214](https://github.com/libgit2/pygit2/issues/1214) <https://github.com/libgit2/pygit2/pull/1214>_

• Update wheels to libgit2 v1.6.4

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

• 4b938a4 Release 1.12.1
• 492f930 Add test for signature repr with none encoding
• 1b896e6 Fix tests
• 449a69c Fix signature repr for default (none) encoding
• 7768099 Merge branch 'fix1205'
• 0526a3f build.sh fix mkdir dir already exists
• 46b93fb _pygit2 typing: Mark optional parameters as optional
• ee16a0d Typing: Fix typo object -> Object
• d91b8cd type hints: Use @typing.overload to specify the return type of .peel
• 459494c Update to libgit2 1.6.4
• Additional commits viewable in compare view