Update test suite branch

Author: dweindl

tox.ini

@@ -14,7 +14,7 @@ description =
 [testenv:unit]
 extras = tests,reports,combine,vis
 deps=
-  git+https://github.com/PEtab-dev/petab_test_suite@math_tests
+  git+https://github.com/PEtab-dev/petab_test_suite@main
   git+https://github.com/Benchmarking-Initiative/Benchmark-Models-PEtab.git@master\#subdirectory=src/python
 
 commands =