We cannot compare against origin/main branch because we build from sdist, not git.

--- tox-4.14.2/tox.ini.orig
+++ tox-4.14.2/tox.ini
@@ -34,7 +34,6 @@
       --cov-report xml:{toxworkdir}{/}coverage.{envname}.xml \
       -n={env:PYTEST_XDIST_AUTO_NUM_WORKERS:auto} \
       tests --durations 5 --run-integration}
-    diff-cover --compare-branch {env:DIFF_AGAINST:origin/main} {toxworkdir}{/}coverage.{envname}.xml
 
 [testenv:fix]
 description = format the code base to adhere to our styles, and complain about what we cannot do automatically
--- tox-4.14.2/pyproject.toml.orig
+++ tox-4.14.2/pyproject.toml
@@ -74,7 +74,6 @@
   "build[virtualenv]>=1.0.3",
   "covdefaults>=2.3",
   "detect-test-pollution>=1.2",
-  "diff-cover>=8.0.2",
   "distlib>=0.3.8",
   "flaky>=3.7",
   "hatch-vcs>=0.4",
--- tox-4.14.2/PKG-INFO.orig
+++ tox-4.14.2/PKG-INFO
@@ -54,7 +54,6 @@
 Requires-Dist: build[virtualenv]>=1.0.3; extra == 'testing'
 Requires-Dist: covdefaults>=2.3; extra == 'testing'
 Requires-Dist: detect-test-pollution>=1.2; extra == 'testing'
-Requires-Dist: diff-cover>=8.0.2; extra == 'testing'
 Requires-Dist: distlib>=0.3.8; extra == 'testing'
 Requires-Dist: flaky>=3.7; extra == 'testing'
 Requires-Dist: hatch-vcs>=0.4; extra == 'testing'