Take advantage of tox 4.12

Author: hynek

.github/workflows/ci.yml

@@ -208,6 +208,7 @@ jobs:
         with:
           python-version-file: .python-version-default
           cache: pip
-      - run: python -Im pip install tox
+      # tox 4.12.0 started passing FORCE_COLOR and NO_COLOR by default.
+      - run: python -Im pip install 'tox>=4.12.0'
 
       - run: python -Im tox run -f color

tox.ini

@@ -15,9 +15,6 @@ wheel_build_env = .pkg
 extras =
     tests: tests
     mypy: typing
-pass_env =
-    FORCE_COLOR
-    NO_COLOR
 commands =
     tests: pytest {posargs}
     mypy: mypy tests/typing
@@ -70,7 +67,6 @@ commands =
         src \
         docs
 
-
 [testenv:docs-linkcheck]
 base_python = {[testenv:docs]base_python}
 extras = {[testenv:docs]extras}