[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/llvm_patches/0011-Detemplatize-small-vector-base.patch

@@ -138,6 +138,3 @@ index 26901fe97d20..3fc16097bd30 100644
 -static_assert(sizeof(SmallVectorSizeType<char>) == sizeof(uint32_t),
 -              "Expected SmallVectorBase<uint32_t> variant to be in use.");
 -#endif
--- 
-2.20.1.windows.1
-