The getPackagesToRelease() util picks wrong version when using pre-releases

[pomek]

📝 Provide detailed reproduction steps (if any)

To avoid going into details on how release tools work, it's enough to say that new versions are retrieved from the changelog. Hence, the release starts with preparing the changelog, then publishing packages.

Let's consider the following changelog:

Changelog
=========

## [1.0.0.alpha.1](URL) (2021-09-23)

Internal changes only (updated dependencies, documentation, etc.).

### Released packages

<details>
<summary>Released packages (summary)</summary>

New packages:

* [ckeditor5-foo](*): v1.0.0.alpha.1
* ...
</details>

When executing a task for bumping versions, invalid versions are suggested for packages in a mono-repository (packages/*).

✔️ Expected result

The pre-release suffix should be picked properly.

? Packages and their old and new versions:
  * "ckeditor5-foo": v0.0.1 => v1.0.0.alpha.1

❌ Actual result

Unfortunately, only MAJOR.MINOR.PATCH parts are read.

? Packages and their old and new versions:
  * "ckeditor5-foo": v0.0.1 => v1.0.0

❓ Possible solution

https://github.com/ckeditor/ckeditor5-dev/blob/079033487ae1ffa98be9e6969a5a1b115439b71d/packages/ckeditor5-dev-env/lib/release-tools/utils/getpackagestorelease.js#L80-L92

Created RegExp picks only numbers and dots. Allowing for letters resolves the problem.