chore: ignore Go in .github/dependabot.yml, take 3 (#24439)

Update to use the documented dependency-name: "*" methodology rather
than an undocumented example.

References:
- https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file

.github/dependabot.yml

@@ -28,4 +28,5 @@ updates:
   # files that no longer exist. Tell dependabot to ignore "gomod"
   - package-ecosystem: "gomod"
     directory: "/"
-    ignore: "*"
+    ignore:
+      - dependency-name: "*"