CI: Fix coverage job for tox 4

Author: adrien-berchet

bluepyparallel/version.py

@@ -1,3 +1,3 @@
 """Version of the bluepyparallel package."""
 
-VERSION = "0.0.8"  # pragma: no cover
+VERSION = "0.0.9.dev0"  # pragma: no cover

tox.ini

@@ -13,6 +13,8 @@ envlist =
 minversion = 3.18
 
 [testenv]
+allowlist_externals =
+    ipcluster
 extras = test
 setenv =
     COVERAGE_FILE = {env:COVERAGE_FILE:.coverage-{envname}}
@@ -43,7 +45,9 @@ commands_post =
 [testenv:coverage]
 skip_install = true
 deps = coverage
-allowlist_externals = /bin/bash
+allowlist_externals =
+    /bin/bash
+    ipcluster
 commands =
     /bin/bash -c 'coverage combine .coverage-py*'
     coverage xml