Merge "tox: Remove ineffective ignore_basepython_conflict and bump minimum version"

tox.ini

@@ -1,11 +1,9 @@
 [tox]
-minversion = 3.1
+minversion = 4.6.0
 skipsdist = True
 envlist = docs,linters,functional
-ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
 usedevelop = True
 commands =
     /usr/bin/find . -type f -name "*.pyc" -delete
@@ -41,7 +39,6 @@ commands =
     doc8 doc
     sphinx-build -W -b html doc/source doc/build/html
 
-
 [testenv:pdf-docs]
 deps = {[testenv:docs]deps}
 allowlist_externals =
@@ -50,18 +47,15 @@ commands =
   sphinx-build -W -b latex doc/source doc/build/pdf
   make -C doc/build/pdf
 
-
 [doc8]
 # Settings for doc8:
 extensions = .rst
 
-
 [testenv:releasenotes]
 deps = {[testenv:docs]deps}
 commands =
     sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
-
 # environment used by the -infra templated docs job
 [testenv:venv]
 commands =