Update dependency libgit2/libgit2 to v1.6.4

This MR contains the following updates:

Package	Type	Update	Change
libgit2/libgit2	ironbank-github	patch	v1.6.3 -> v1.6.4

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Release Notes

libgit2/libgit2

v1.6.4: libgit2 v1.6.4

Compare Source

What's Changed

Bug fixes

• config: return GIT_ENOTFOUND for missing programdata by @​ethomson in https://github.com/libgit2/libgit2/pull/6547

Full Changelog: https://github.com/libgit2/libgit2/compare/v1.6.3...v1.6.4

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