Update parcel watcher to 2.5.0

[tsmaeder]

What it does

This should fix #14529

Contributed on behalf of STMicroelectronics

There was a deadlock issue in @parcel/watcher 2.4.x that is consistent with the behavior we were observing (see issue). I could reliably reproduce the issue with the scenario described in "How to test". After the update, I can't reproduce the issue with that scenario.

How to test

1. Open two Electron Theia Windows on two different copies of the Theia source code.
2. Repeatedly and concurrently run yarn and git clean -xfd on the command line in the two source root folders.
3. Observe: without the update, eventually not file changes would be detected anymore. With the update, the file changes continue to work (change a file and observe that the file shows up in the git "changes" view.

Follow-ups

• Handle "too many changes" from parcel watcher #14544

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[sdirix]

The fix works for me. Without the PR I never get any change automatically into the source view. With the PR it works without issues.

[msujew]

FYI, just wanted to tell that the fix works well for me as well.