Dependabot: drop Selenium dependency updates in v4.0.x

That branch is so far behind it needs a comprehensive
Selenium suite dependency bump.

Author: michaelklishin

.github/dependabot.yaml

@@ -168,17 +168,4 @@ updates:
         update-types:
           - "minor"
           - "patch"
-  - package-ecosystem: "npm"
-    directory: "/selenium"
-    schedule:
-      interval: "daily"
-    target-branch: "v4.0.x"
-    cooldown:
-      semver-minor-days: 3
-      semver-major-days: 3
-    groups:
-      minor-patch-updates:
-        applies-to: version-updates
-        update-types:
-          - "minor"
-          - "patch"
+