Splite coverage combine & report in local tox

Avoids 80+ lines saying something like:

Combined data file .coverage.nazare.fritz.box.54735.XtvwSeqx

Author: hynek

tox.ini

@@ -32,7 +32,7 @@ commands =
 dependency_groups = tests
 commands = pytest tests/test_functional.py
 
-# Keep versions in-sync with coverage-report.
+# Keep versions in-sync with coverage-combine.
 [testenv:py3{9,10,14}-tests]
 dependency_groups = cov
 # Python 3.6+ has a number of compile-time warnings on invalid string escapes.
@@ -43,17 +43,24 @@ set_env =
 commands =
     coverage run -m pytest {posargs:-n auto}
 
-[testenv:coverage-report]
+# Split combine/report in 2 to avoid excessive "Combined data file ..." output.
+[testenv:coverage-combine]
 # Keep base_python in-sync with .python-version-default
 base_python = py313
 # Keep depends in-sync with testenv above that has the cov dependency group.
 depends = py3{9,10,14}-tests
+skip_install = true
+dependency_groups = cov
+commands = coverage combine
+
+[testenv:coverage-report]
+# Keep base_python in-sync with .python-version-default
+base_python = py313
+depends = coverage-combine
 parallel_show_output = true
 skip_install = true
 dependency_groups = cov
-commands =
-    coverage combine
-    coverage report
+commands = coverage report
 
 
 [testenv:codspeed]