build(deps): bump git2 from 0.14.3 to 0.15.0

[dependabot[bot]]

Bumps git2 from 0.14.3 to 0.15.0.

Commits

• 4979a86 we have to expect non-utf8 strings in tracing messages (#770)
• c7025a7 Merge pull request #776 from extrawurst/master
• 68eecf6 remove unused dependency
• 4760c18 Merge pull request #771 from gibfahn/log_typo
• 869790f Fix stdout->stderr typo in cred.rs
• 6f3905d Bump versions
• 979d2d5 Mark OdbReader and OdbWriter Send (#765)
• 33b14ce Make Odb Send and Sync (#763)
• 4949647 Consistently derive Copy, Clone, Debug, PartialEq, and Eq for types (#764)
• 2afab9f Derive Debug for IndexEntry, IndexTime, and Time (#762)
• Additional commits viewable in compare view

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