source_url in Maven::UpdaterChecker::RequirementsUpdater can be nil

[JamieMagee]

What are you trying to accomplish?

We're seeing the following Sorbet errors:

Parameter 'source_url': Expected type String, got type NilClass
Caller: /home/dependabot/dependabot-updater/vendor/ruby/3.3.0/gems/sorbet-runtime-0.5.11577/lib/types/private/methods/call_validation.rb:133
Definition: /home/dependabot/maven/lib/dependabot/maven/update_checker/requirements_updater.rb:34 (Dependabot::Maven::UpdateChecker::RequirementsUpdater#initialize)

Anything you want to highlight for special attention from reviewers?

How will you know you've accomplished your goal?

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.