fix docs' requirements

pyproject.toml

@@ -106,7 +106,7 @@ docs = [
     "mkdocstrings-python==1.9.2",  # to build reference documentation from docstrings
     "pdfCropMargins==2.1.2",       # to generate entry figures for the documentation
     "pillow==10.1.0",              # lock the dependency of pdfCropMargins
-    "PySimpleGUI==4.20.0",         # lock the dependency of pdfCropMargins
+    "PySimpleGUI==4.24.0",         # lock the dependency of pdfCropMargins
     "mkdocs-macros-plugin==1.0.5", # to be able to have dynamic content in the documentation
 ]
 tests = [