0.5.2a: Bump netcdf4 from 1.5.4 to 1.5.7 in /.depends (#171)

Bumps [netcdf4](https://github.com/Unidata/netcdf4-python) from 1.5.4 to 1.5.7.
- [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
...

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