chore: moved xterm to maintained packages again

[mzedel]

Unfortunately the switch to scoped packages was missed and we were tracking the deprecated packages - this should address this. https://github.com/xtermjs/xterm.js/releases/tag/5.4.0 provides context

[mender-test-bot]

@mzedel, Let me know if you want to start the integration pipeline by mentioning me and the command "start pipeline".

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my commands and options

You can trigger a pipeline on multiple prs with:

• mentioning me and start pipeline --pr mender/127 --pr mender-connect/255

You can start a fast pipeline, disabling full integration tests with:

• mentioning me and start pipeline --fast

You can trigger GitHub->GitLab branch sync with:

• mentioning me and sync

You can cherry pick to a given branch or branches with:

• mentioning me and:

 cherry-pick to:
 * 1.0.x
 * 2.0.x