Merge pull request #369 from communitiesuk/dependabot/pip/pixelmatch-approx-eq-0.4.0

Update pixelmatch requirement from ~=0.3.1 to ~=0.4.0

Author: github-actions[bot]

requirements.txt

@@ -15,7 +15,7 @@ dash[testing]~=3.4.0
 chromedriver-autoinstaller~=0.6.4
 playwright~=1.58.0
 pytest-playwright~=0.7.2
-pixelmatch~=0.3.1
+pixelmatch~=0.4.0
 pillow~=12.1.1
 snakeviz~=2.2.2
 python-dateutil~=2.9.0