Update to use latest version of pygeoif

[geographika]

Overview

Updates the project to use the latest version of pygeoif. This was pinned in #789, but this no longer seems necessary.
See also geopython/pygeofilter#64.

One minor update required to work with the latest pygeofilter API (a dependency of pygeoif):

https://github.com/geopython/pygeofilter/blob/25743c9c5472f1d77a76607e3364418919d1f25e/pygeofilter/backends/sqlalchemy/filters.py#L260

Contributions and Licensing

(as per https://github.com/geopython/pycsw/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• I'd like to contribute this update to pycsw. I confirm that my contributions to pycsw will be compatible with the pycsw license guidelines at the time of contribution.