Add slots to signal generators

pyproject.toml

@@ -9,9 +9,9 @@ dependencies = [
   "numpy",
   "qtpy",
   "graphviz>=0.19",
-  "matplotlib",
+  "matplotlib>=3.7",
   "setuptools_scm[toml]>=6.2",
-  "networkx",
+  "networkx>=3",
   "qtawesome"
 ]
 classifiers = [