Reduce verbosity when a single version changes

[dsherret]

Based on feedback from Ry, it would be ideal if the lockfile only stored the version of a package once when there is only one version of a package (jsr or npm). For example, bumping the patch of an npm package should have one change and not many changes.

Probably the "dependencies" field's value should not have a version number if there's only one version of a package.