Pinned SICOR version to above 0.15.6.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
5 jobs for v0.17.0 in 10 minutes and 55 seconds (queued for 24 minutes and 33 seconds)
latest
Status Name Job ID Coverage
  Test
passed test_enpt #61216

00:07:34

91.0%
passed test_styles #61217

00:00:40

passed test_urls #61218

00:01:14

 
  Deploy
passed create_github_release #61220

00:00:37

passed deploy_pypi #61219

00:00:48