(temporarily) use ewatercycle-HBV from ewatercycle org

[BSchilperoort]

Currently we use the pip ewatercycle-hbv package.

infra/roles/ewatercycle/templates/environment.yml.j2

Lines 16 to 18 in 5fd4933

	- ewatercycle-HBV==1.8.4
	# TODO ewatercycle-HBV should not depend on HBV, but currently it does
	- HBV==1.5.2

However, some important patches were done in https://github.com/ewatercycle/ewatercycle-hbv and David does not have much time to work on this now.

@RolfHut wants to temporarily use the forked version, until the new TU Delft RSE can work on this

Todo:

• temporarily point to ewatercycle/ewatercycle-hbv in environment.yml
• have new RSE take ownership of ewatercycle-hbv, and update the package in pypi
• use the pypi version again