build(deps): bump netcdf4 from 1.6.2 to 1.6.4

Bumps [netcdf4](https://github.com/Unidata/netcdf4-python) from 1.6.2 to 1.6.4.
- [Release notes](https://github.com/Unidata/netcdf4-python/releases)
- [Changelog](https://github.com/Unidata/netcdf4-python/blob/master/Changelog)
- [Commits](https://github.com/Unidata/netcdf4-python/commits)

---
updated-dependencies:
- dependency-name: netcdf4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>