VFS for Git 2.0.26281.1 (M281)

What's Changed

• Update default Microsoft Git version to v2.55.0.vfs.0.10 by Johannes Schindelin (@dscho) in #2111
• Marshal libgit2 P/Invoke strings as UTF-8, not ANSI by Tyrie Vella (@tyrielv) in #2110
• docs(agents): clarify functional test dev workflow by Tyrie Vella (@tyrielv) in #2114
• Retry native C++ project builds on transient MSBuild PCH failure by Tyrie Vella (@tyrielv) in #2117
• Add functional regression tests for reset --mixed skip-worktree on hydrated placeholders by Tyrie Vella (@tyrielv) in #2018
• Bump actions/upload-artifact from 7 to 7 by Dependabot (@dependabot)[bot] in #2128
• Add IsSendingAnonymousRequests to VFS.Heartbeat by Tyrie Vella (@tyrielv) in #2125
• Fix regression causing credential prompts to hide behind other windows more often by Tyrie Vella (@tyrielv) in #2127

Full Changelog: v2.0.26259.1...v2.0.26281.1