[DEV] releaseTools.getNextPreRelease() returns invalid numbers after .10

[pomek]

📝 Provide detailed reproduction steps (if any)

Nightly alpha releases from the #release branch stopped working during the last weekend.

CI logs presets as follows:

Version 42.0.0-alpha.10
[STARTED] Verify the repository.
[SKIPPED] Verify the repository.
[STARTED] Preparation phase.
[STARTED] Updating "version" value.
[FAILED] The "@ckeditor/ckeditor5-editor-inline@******-alpha.10" already exists in the npm registry.
[FAILED] The "@ckeditor/ckeditor5-editor-inline@******-alpha.10" already exists in the npm registry.

It tried several times to push the already published version:

✔️ Expected result

• There are no errors, and the release process goes fine.
• The next proposed @alpha version should be incremented precisely.

❌ Actual result

As mentioned in the issue description.

❓ Possible solution

A quick debug session led me to https://github.com/ckeditor/ckeditor5-dev/blob/f0e2026c0d9889eedfb99bfeacaf8dd13b01b9e4/packages/ckeditor5-dev-release-tools/lib/utils/versions.js#L45-L48

It returns:

[
  '42.0.0-alpha.0',
  '42.0.0-alpha.1',
  '42.0.0-alpha.10',
  '42.0.0-alpha.2',
  '42.0.0-alpha.3',
  '42.0.0-alpha.4',
  '42.0.0-alpha.5',
  '42.0.0-alpha.6',
  '42.0.0-alpha.7',
  '42.0.0-alpha.8',
  '42.0.0-alpha.9'
]

while it should be

[
  '42.0.0-alpha.0',
  '42.0.0-alpha.1',
  '42.0.0-alpha.2',
  '42.0.0-alpha.3',
  '42.0.0-alpha.4',
  '42.0.0-alpha.5',
  '42.0.0-alpha.6',
  '42.0.0-alpha.7',
  '42.0.0-alpha.8',
  '42.0.0-alpha.9',
  '42.0.0-alpha.10'
]