fix: use actions/labeler@v5 config file format

[lemeurherve]

This PR adapts the labeler config file to the new format introduced in version 5.

Related to:

• Fix Labeller config file to new v5 syntax #855

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[lemeurherve]

I signed-off my commit with the mail I've used to create my Eclipse account and sign the ECA, I don't know what to do more.

[karianna]

@lemeurherve I revalidated the signing process so that passes now. Reading the labeler documentation tells me your change is likely correct but it's hard to tell since pull_request_target only runs against the base branch (https://github.com/actions/labeler?tab=readme-ov-file#notes-regarding-pull_request_target-event) it still 'fails'. I'll merge this as it's a step in the right direction.

[karianna]

This is a step in the right direction

[karianna]

Needs one more approval