Renovate config: give the dependency groups better names

This should make the sentences in #11588 (comment) make more sense...

Author: AlexWaygood

.github/renovate.json

@@ -20,22 +20,22 @@
   ],
   "packageRules": [
     {
-      "groupName": "GitHub Actions update",
+      "groupName": "GitHub Actions",
       "matchManagers": ["github-actions"],
       "description": "Quarterly update of GitHub Action dependencies",
       "separateMajorMinor": "false",
       "schedule": ["every 3 months on the first day of the month"]
     },
     {
-      "groupName": "Quarterly dependency update",
+      "groupName": "most test/lint dependencies",
       "matchManagers": ["pip_requirements", "pre-commit"],
       "excludePackageNames": ["pytype", "pyright"],
       "description": "Quarterly update of most test dependencies",
       "separateMajorMinor": "false",
       "schedule": ["every 3 months on the first day of the month"]
     },
     {
-      "groupName": "Daily dependency update",
+      "groupName": "pytype and pyright",
       "matchManagers": ["pip_requirements", "regex"],
       "matchPackageNames": ["pytype", "pyright"],
       "description": "Daily update of pyright and pytype",