Group dependabot updates

[coretl]

Update dependabot yaml to:

# To get started with Dependabot version updates, you'll need to specify which
# package ecosystems to update and where the package manifests are located.
# Please see the documentation for all configuration options:
# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates

version: 2
updates:
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"
    groups:
      actions:
        patterns:
          - "*"

  - package-ecosystem: "pip"
    directory: "/"
    schedule:
      interval: "weekly"
    groups:
      pip:
        patterns:
          - "*"