Ignore unstable semver versions

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

Currently Dependabot seems [only able to ignore major, minor and patch version](https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#specifying-dependencies-and-versions-to-ignore). Would it be possible to ignore unstable versions, built by adding extensions to the semver versions, such as prereleases?

The issue names no files, tests, or entry points. Start by tracing Dependabot's dependency-version ignore configuration and semver handling, then establish expected behavior for prerelease versions and identify the relevant test coverage before estimating the change.

Written by the indexing model from the issue text.