Upgrade git2 to fix compliation on nightly
The compilation error is a known regression related to a soundness fix.
The latest git2 avoid the error. See also
@@ -999,9 +999,9 @@ checksum = "f6503fe142514ca4799d4c26297c4248239fe8838d827db6bd6065c6ed29a6ce"
[[package]]
name = "git2"
-version = "0.13.18"
+version = "0.13.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b483c6c2145421099df1b4efd50e0f6205479a072199460eff852fa15e5603c7"
+checksum = "d9831e983241f8c5591ed53f17d874833e2fa82cac2625f3888c50cbfe136cba"
dependencies = [
"bitflags",
"libc",
@@ -1341,9 +1341,9 @@ checksum = "18794a8ad5b29321f790b55d93dfba91e125cb1a9edbd4f8e3150acc771c1a5e"
[[package]]
name = "libgit2-sys"
-version = "0.12.19+1.1.0"
+version = "0.12.21+1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f322155d574c8b9ebe991a04f6908bb49e68a79463338d24a43d6274cb6443e6"
+checksum = "86271bacd72b2b9e854c3dcfb82efd538f15f870e4c11af66900effb462f6825"
dependencies = [
"cc",
"libc",
