Update tox configuration for version 4

Related to swh/meta#4959 (closed)

tox.ini

@@ -24,7 +24,7 @@ commands =
 [testenv:py3]
 skip_install = true
 deps = tox
-commands = tox -e py3-core-db-server-github-slow-cover -- {posargs}
+commands = tox run -e py3-core-db-server-github-slow-cover -- {posargs}
 
 [testenv:black]
 skip_install = true
@@ -58,7 +58,7 @@ commands =
 # git HEAD of swh-docs, is executed on CI for each diff to prevent
 # breaking doc build
 [testenv:sphinx]
-whitelist_externals = make
+allowlist_externals = make
 usedevelop = true
 extras =
   testing-core
@@ -68,7 +68,7 @@ extras =
   github
 deps =
   # fetch and install swh-docs in develop mode
-  -e git+https://forge.softwareheritage.org/source/swh-docs#egg=swh.docs
+  -e git+https://gitlab.softwareheritage.org/swh/devel/swh-docs.git\#egg=swh.docs
 
 setenv =
   SWH_PACKAGE_DOC_TOX_BUILD = 1
@@ -81,7 +81,7 @@ commands =
 # build documentation only inside swh-environment using local state
 # of swh-docs package
 [testenv:sphinx-dev]
-whitelist_externals = make
+allowlist_externals = make
 usedevelop = true
 extras =
   testing-core