remove pytest dependency

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "cnapy"
-version = "1.2.2"
+version = "1.2.3"
 authors = [
   { name="Sven Thiele" },
   { name="Axel von Kamp", email="vonkamp@mpi-magdeburg.mpg.de" },
@@ -15,10 +15,10 @@ classifiers = [
     "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
     "Operating System :: OS Independent",
 ]
-dependencies = ["pytest>=7.2", "appdirs>=1.4", "matplotlib-base>=3.6", "requests>=2.28",
+dependencies = ["appdirs>=1.4", "matplotlib-base>=3.6", "requests>=2.28",
                 "cobra>=0.29", "efmtool_link>=0.0.7", "optlang_enumerator>=0.0.12", "straindesign>=1.12",
                 "qtpy>=2.3", "pyqtwebengine>=5.15", "qtconsole==5.4",
-                "gurobi", "cplex", "numpy==1.23", "scipy==1.12", "openpyxl"]
+                "gurobi", "cplex>=22.1", "numpy==1.23", "scipy==1.12", "openpyxl"]
 
 [project.urls]
 Homepage = "https://github.com/cnapy-org/CNApy"