Add multiple package ecosystem on dependabot config

[vczb]

Update the dependabot config to allow multiple update blocks, each targeting a specific package ecosystem. Here's an example of how you can configure Dependabot to handle both bundler and npm updates:

version: 2
updates:
  - package-ecosystem: 'bundler'
    directory: '/'
    schedule:
      interval: 'weekly'
  - package-ecosystem: 'npm'
    directory: '/'
    schedule:
      interval: 'weekly'

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please double-check the dependabot documentation to make sure that the example above works as expected

thanks in advance

[vczb]

closed by #222