Update dependency libgit2/libgit2 to v1.6.3

This MR contains the following updates:

Package	Type	Update	Change
libgit2/libgit2	ironbank-github	patch	v1.6.2 -> v1.6.3

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Release Notes

libgit2/libgit2

v1.6.3: libgit2 v1.6.3

Compare Source

What's Changed

Bug fixes

• odb: restore git_odb_open by @​ethomson in https://github.com/libgit2/libgit2/pull/6520
• Ensure that git_index_add_all handles ignored directories by @​ethomson in https://github.com/libgit2/libgit2/pull/6521
• pack: use 64 bits for the number of objects by @​carlosmn in https://github.com/libgit2/libgit2/pull/6530

Build and CI improvements

• Remove unused wditer variable by @​georgthegreat in https://github.com/libgit2/libgit2/pull/6518
• fs_path: let root run the ownership tests by @​ethomson in https://github.com/libgit2/libgit2/pull/6513
• sysdir: Do not declare win32 functions on non-win32 platforms by @​Batchyx in https://github.com/libgit2/libgit2/pull/6527
• cmake: don't include include/git2 by @​ethomson in https://github.com/libgit2/libgit2/pull/6529

New Contributors

• @​georgthegreat made their first contribution in https://github.com/libgit2/libgit2/pull/6518

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.6.2...v1.6.3

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