Bump netcdf4 from 1.6.5 to 1.7.1.post1

Bumps [netcdf4](https://github.com/Unidata/netcdf4-python) from 1.6.5 to 1.7.1.post1.
- [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/v1.7.1.post1)

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

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