Run 3.12 under coverage instead of 3.11

Author: hynek

tox.ini

@@ -29,7 +29,7 @@ commands =
     mypy: mypy tests/typing_example.py
     mypy: mypy src/attrs/__init__.pyi src/attr/__init__.pyi src/attr/_typing_compat.pyi src/attr/_version_info.pyi src/attr/converters.pyi src/attr/exceptions.pyi src/attr/filters.pyi src/attr/setters.pyi src/attr/validators.pyi
 
-[testenv:py3{7,10,11}-tests]
+[testenv:py3{7,10,12}-tests]
 extras = cov
 # Python 3.6+ has a number of compile-time warnings on invalid string escapes.
 # PYTHONWARNINGS=d and --no-compile below make them visible during the tox run.
@@ -43,7 +43,7 @@ commands = coverage run -m pytest {posargs:-n auto}
 
 [testenv:coverage-report]
 # Keep base_python in-sync with .python-version-default
-base_python = py311
+base_python = py312
 depends = py3{7,10,11}
 skip_install = true
 deps = coverage[toml]>=5.3