MAINT: limit ipython in tox job, too (#687)

* MAINT: adding ipython/coconut limit into tox

* MAINT: adding pip, too

Author: bsipocz

tox.ini

@@ -28,7 +28,10 @@ commands = pytest {posargs}
 [testenv:docs-{update,clean}]
 extras = rtd
 deps =
-    ipython
+    # this is only required by coconut kernel
+    # Version limit is due to coconut and ipython inncompatibility as of 24/4/2025
+    ipython<9
+    pip
 setenv =
     BUILDER = {env:BUILDER:html}
 allowlist_externals =