Autoformat functorch/codegen/gen_vmap_plumbing.py (#82246)
The next PR up in the stack requires this for lintrunner to be happy.
There are no logical changes; the file was autoformatted via the
following:
```
mv functorch/codegen/gen_vmap_plumbing.py torchgen/gen_vmap_plumbing.py
lintrunner torchgen/gen_vmap_plumbing.py -a
mv torchgen/gen_vmap_plumbing.py functorch/codegen/gen_vmap_plumbing.py
```
Test Plan:
- build functorch
Differential Revision: [D38171956](https://our.internmc.facebook.com/intern/diff/D38171956)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82246
Approved by: https://github.com/kit1980
