fix: suppress dependency update lines in changelog output

[Gawdfrey]

Summary

Replaces getDependencyReleaseLine with a no-op that returns an empty string.

Internal dependency bumps (e.g. @repo/schemas@1.5.0) are implementation details that add noise to module changelogs without providing useful context. When using updateInternalDependents: "always" in a monorepo, every dependency bump produces "Updated dependencies" lines in all dependent packages — this clutters changelogs with entries that aren't actionable for consumers.

Before:

## 0.3.1

### Patch Changes

Updated dependencies:
  - @repo/schemas@1.5.0

After:

## 0.3.1

If a module has its own changesets alongside the auto-bump, those entries still appear normally.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9dd2d17

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@stacc/changeset-formatter	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR