Bump splinter from 0.16.0 to 0.17.0

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

requirements-dev.txt

@@ -3,7 +3,7 @@ nose2[coverage_plugin]==0.10.0
 cov-core==1.15.0
 pycodestyle==2.8.0
 pylint==2.12.2
-splinter==0.16.0
+splinter==0.17.0
 selenium==4.1.0
 twine==3.7.1
 Pallets-Sphinx-Themes==2.0.2