Update dependency robotframework-seleniumlibrary to v6

Author: renovate[bot]

requirements.txt

@@ -8,7 +8,7 @@ requests==2.28.2
 robotframework==4.1.3
 robotframework-pythonlibcore==2.2.1
 robotframework-selenium2library==3.0.0
-robotframework-seleniumlibrary==5.1.3
+robotframework-seleniumlibrary==6.0.0
 selenium==3.141.0
 soupsieve==2.3.2.post1
 tqdm==4.64.1