[upstream_utils] Remove git version from upstream patches (#4351)

This reduces commit noise when other git versions are used. The version
was removed by passing `--no-signature` to `git format-patch` which is
now documented in the readme.

upstream_utils/libuv_patches/0001-Fix-missing-casts.patch

@@ -1545,6 +1545,3 @@ index 9943205..c655f53 100644
  
      if (var == NULL) {
        r = UV_ENOMEM;
--- 
-2.25.1
-