Deploy git 2.20.1 to prod win depot_tools users

Bug: 887141
Change-Id: I9850238f3beb8e4c61deb20a1b2fdfd9e84df935
Reviewed-on: https://chromium-review.googlesource.com/c/1416492
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>

bootstrap/win/manifest.txt

@@ -17,4 +17,4 @@ $VerifiedPlatform windows-386 windows-amd64
 infra/python/cpython/windows-386 version:2.7.6
 
 @Subdir git
-infra/git/windows-${arch} version:2.18.0.chromium16
+infra/git/windows-${arch} version:2.20.1.chromium16