Bump mgrs from 1.3.8 to 1.4.0 (#140)

Bumps [mgrs](https://github.com/hobu/mgrs) from 1.3.8 to 1.4.0.
- [Release notes](https://github.com/hobu/mgrs/releases)
- [Commits](https://github.com/hobu/mgrs/compare/1.3.8...1.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Meisterschueler <kammermark@gmx.de>

setup.py

@@ -45,8 +45,8 @@ setup(
         'geoalchemy2==0.8.4',
         'shapely==1.7.1',
         'ogn-client==0.9.7',
+        'mgrs==1.4.0',
         'psycopg2-binary==2.8.6',
-        'mgrs==1.3.8',
         'xmlunittest==0.5.0',
         'flower==0.9.5',
         'tqdm==4.50.2',