build(deps): update pygit2 requirement from <1.6.0,>=1.2.1 to >=1.2.1,<1.7.0

[dependabot]

Updates the requirements on pygit2 to permit the latest version.

Changelog

Sourced from pygit2's changelog.

1.6.0 (2021-06-01)

• New optional proxy argument in Remote methods [#642](https://github.com/libgit2/pygit2/issues/642) <https://github.com/libgit2/pygit2/issues/642>_ [#1063](https://github.com/libgit2/pygit2/issues/1063) <https://github.com/libgit2/pygit2/pull/1063>_ [#1069](https://github.com/libgit2/pygit2/issues/1069) <https://github.com/libgit2/pygit2/issues/1069>_

• New GIT_MERGE_PREFERENCE constants [#1071](https://github.com/libgit2/pygit2/issues/1071) <https://github.com/libgit2/pygit2/pull/1071>_

• Don't require cached-property with Python 3.8 or later [#1066](https://github.com/libgit2/pygit2/issues/1066) <https://github.com/libgit2/pygit2/pull/1066>_

• Add wheels for aarch64 [#1077](https://github.com/libgit2/pygit2/issues/1077) <https://github.com/libgit2/pygit2/issues/1077>_ [#1078](https://github.com/libgit2/pygit2/issues/1078) <https://github.com/libgit2/pygit2/pull/1078>_

• Documentation fixes [#1068](https://github.com/libgit2/pygit2/issues/1068) <https://github.com/libgit2/pygit2/pull/1068>_ [#1072](https://github.com/libgit2/pygit2/issues/1072) <https://github.com/libgit2/pygit2/pull/1072>_

• Refactored build and CI, new build.sh script

Breaking changes:

• Remove deprecated GIT_CREDTYPE_XXX contants, use GIT_CREDENTIAL_XXX instead.

• Remove deprecated Patch.patch getter, use Patch.text instead.

1.5.0 (2021-01-23)

• New PackBuilder class and Repository.pack(...) [#1048](https://github.com/libgit2/pygit2/issues/1048) <https://github.com/libgit2/pygit2/pull/1048>_

• New Config.delete_multivar(...) [#1056](https://github.com/libgit2/pygit2/issues/1056) <https://github.com/libgit2/pygit2/pull/1056>_

• New Repository.is_shallow [#1058](https://github.com/libgit2/pygit2/issues/1058) <https://github.com/libgit2/pygit2/pull/1058>_

• New optional message argument in Repository.create_reference(...) [#1061](https://github.com/libgit2/pygit2/issues/1061) <https://github.com/libgit2/pygit2/issues/1061>_ [#1062](https://github.com/libgit2/pygit2/issues/1062) <https://github.com/libgit2/pygit2/pull/1062>_

• Fix truncated diff when there are nulls [#1047](https://github.com/libgit2/pygit2/issues/1047) <https://github.com/libgit2/pygit2/pull/1047>_

... (truncated)

Commits

• 5c33d86 Release 1.6.0
• e352728 Setup: add project URLs
• 17d5bb1 Update Changelog
• 96d5e6b Remove deprecated code
• aa3c079 Merge remote-tracking branch 'odidev/odidev_pygit2'
• 2d7e9d0 Add linux aarch64 wheel support
• f46e141 Docs: Update (fix) description of GIT_SORT constants
• fadfdde Fix proxy specified
• 7cdd043 Fix garbled mirror configuration in recipe for git clone --mirror
• a2f2554 Fix AppVeyor upload to pypi
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

Merging #27 (7c73786) into master (bcd59c8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   55.00%   55.00%           
=======================================
  Files         124      124           
  Lines        7243     7243           
  Branches      752      752           
=======================================
  Hits         3984     3984           
  Misses       3128     3128           
  Partials      131      131           

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[dependabot]

Superseded by #44.