Update libssh2-sys

Author: ehuss

Cargo.lock

@@ -1954,9 +1954,9 @@ dependencies = [
 
 [[package]]
 name = "libssh2-sys"
-version = "0.2.19"
+version = "0.2.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca46220853ba1c512fc82826d0834d87b06bcd3c2a42241b7de72f3d2fe17056"
+checksum = "b094a36eb4b8b8c8a7b4b8ae43b2944502be3e59cd87687595cf6b0a71b3f4ca"
 dependencies = [
  "cc",
  "libc",