Bump geoalchemy2 from 0.8.3 to 0.8.4
Bump geoalchemy2 from 0.8.3 to 0.8.4

Bumps [geoalchemy2](https://github.com/geoalchemy/geoalchemy2) from 0.8.3 to 0.8.4.
- [Release notes](https://github.com/geoalchemy/geoalchemy2/releases)
- [Changelog](https://github.com/geoalchemy/geoalchemy2/blob/master/CHANGES.txt)
- [Commits](https://github.com/geoalchemy/geoalchemy2/compare/0.8.3...0.8.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Meisterschueler/ogn-python,glidernet/ogn-python,Meisterschueler/ogn-python,Meisterschueler/ogn-python,glidernet/ogn-python,Meisterschueler/ogn-python,glidernet/ogn-python,glidernet/ogn-python