[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/stack_walker_patches/0003-Add-advapi-pragma.patch

@@ -19,6 +19,3 @@ index 48c7c57..6f0fbf2 100644
  #pragma warning(disable : 4826)
  
  #ifdef UNICODE
--- 
-2.20.1.windows.1
-