Dependabot not firing

[LahaLuhem]

There was a new gradle-wrapper version available but no PR. So I checked it and I think that it may be because the next target branch is specific and it doesn't exist, so it won't fire.
Any reason why that was done?

Because usually a config like:

version: 2
updates:
  - package-ecosystem: "gradle"
    directory: "/"
    schedule:
      interval: "weekly"
    groups:
      gradle:
        patterns: ["*"]
        update-types: ["minor", "patch"]

  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"
    groups:
      actions:
        patterns: ["*"]
        update-types: ["minor", "patch"]

is enough for it to make temporary branches and open PRs?