[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/0003-Preprocessor-cleanup.patch

@@ -177,6 +177,3 @@ index a68b095..7843e9f 100644
  
  /* Whether there are any non-IFS LSPs stacked on TCP */
  int uv_tcp_non_ifs_lsp_ipv4;
--- 
-2.25.1
-