build(deps): bump pytorch-lightning from 1.6.3 to 1.6.4
build(deps): bump pytorch-lightning from 1.6.3 to 1.6.4

Bumps [pytorch-lightning](https://github.com/PyTorchLightning/pytorch-lightning) from 1.6.3 to 1.6.4.
- [Release notes](https://github.com/PyTorchLightning/pytorch-lightning/releases)
- [Changelog](https://github.com/PyTorchLightning/pytorch-lightning/blob/1.6.4/CHANGELOG.md)
- [Commits](https://github.com/PyTorchLightning/pytorch-lightning/compare/1.6.3...1.6.4)

---
updated-dependencies:
- dependency-name: pytorch-lightning
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
aevri/mel,aevri/mel