Exclude 'cpanfile' from Renovate

[ehuelsmann]

🤔 What's changed?

Renovate does not upgrade Perl dependencies anymore.

⚡️ What's your motivation?

The Perl ecosystem is generally pretty good about managing its dependencies. Specifying minimum requirements is usually capability-based.

🏷️ What kind of change is this?

• 🧰

♻️ Anything particular you want feedback on?

How to upgrade the messages dependency on new messages releases? (It usually takes a few hours for new messages releases to become visible on MetaCPAN.)

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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[mpkorstanje]

The Perl ecosystem might be good at managing dependencies, we are not:

gherkin/perl/cpanfile

Line 5 in c6de581

requires "Cucumber::Messages", ">= 22.0.0, < 23.0.0";

Excluding the cpan file altogether will also mean that the version of messages is not automatically upgraded anymore.

Would it be possible to exclude all other dependencies but those from Cucumber? And if so, can that be done in the https://github.com/cucumber/renovate-config instead? That will catch all projects.