Change GITHUB_TOKEN so that apply-labels.yml workflow can be triggered on any PR

[lotyp]

Currently this workflow

https://github.com/buggregator/trap/actions/runs/9773787716/job/26980653857?pr=133 is failing, because when external contributor submits PR, default GITHUB_TOKEN does not have enough permissions to set default labels.

Tasks:

• Create separate token for apply-labels.yml workflow
• Change default token in this workflow

[roxblnfk]

Added TRAP_LABELER_TOKEN (approve from @butschster required)