update libgit2 submodule to recent main

staktrace · staktrace · commit d794a152340a · 2021-05-14T20:11:14.000-04:00
This is specifically to pick up the fix at libgit2/libgit2#5839
diff --git a/libgit2-sys/libgit2 b/libgit2-sys/libgit2
@@ -1 +1 @@
-Subproject commit 4bd172087c30e09e7720a7df11cace47ee002256
+Subproject commit be95f684da5d05e59919448c1061febbd4ff6eb8
