Updated dugite-extra and find-git-exec.

The updated dependencies contain fix for:
 - The termination of the spawned process. The bogus process termination resulted in an empty string from the `stdout` as the `exec-path`. The empty string "path" was incorrectly normalized to `.`. (See: eclipse-theia#6587)
 - [win32]: Enhanced `git` discovery. The new logic falls back to `which`.
 - [win32]: The unstaging command. `-u` was added to ensure that git's index reflects a consistent view of the working tree after the operation has been performed.

Signed-off-by: Akos Kitta <kittaakos@typefox.io>

packages/git/package.json

@@ -13,9 +13,9 @@
     "@types/diff": "^3.2.2",
     "@types/p-queue": "^2.3.1",
     "diff": "^3.4.0",
-    "dugite-extra": "0.1.11",
-    "find-git-exec": "^0.0.1-alpha.2",
-    "find-git-repositories": "^0.1.1",
+    "dugite-extra": "0.1.12",
+    "find-git-exec": "^0.0.2",
+    "find-git-repositories": "^0.1.0",
     "moment": "^2.21.0",
     "octicons": "^7.1.0",
     "p-queue": "^2.4.2",