Fixes issues related with Dependabot::NpmAndYarn::UpdateChecker::LatestVersionFinder::RegistryError

[sachin-sandhu]

What are you trying to accomplish?

Preface: Fixes Dependabot::NpmAndYarn::UpdateChecker::LatestVersionFinder::RegistryError issues when a private registry returns a server error.

Issue: updater raises RegistryError exception when private registry requests returns 3xx, 4xx, 5xx response codes. This exception is coming up in unknown_error exception count.

+-------------------------------+
| Dependencies failed to update |
+---------------+---------------+
| elliptic      | unknown_error |
+---------------+---------------+

Fix: To isolate the 5xx server issues and raise a proper exception instead.

+-------------------------------------------+
|       Dependencies failed to update       |
+----------+--------------------------------+
| elliptic | dependency_file_not_resolvable |
+----------+--------------------------------+

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.