Fix issue labeler workflow

[xrmx]

Describe the bug:

Update labeler workflow to use the correct actions and groups, see nodejs changes:
https://github.com/elastic/apm-agent-nodejs/pull/3906/files

To Reproduce

1. Open an issue as @xrmx
2. Issues labeled as community

Environment (please complete the following information)

• OS: [e.g. Linux]
• Python version:
• Framework and version [e.g. Django 2.1]:
• APM Server version:
• Agent version:

Additional context

None

[trentm]

There was an error in #2003. The labeler workflow is failing: https://github.com/elastic/apm-agent-python/actions/workflows/labeler.yml with:

 Invalid workflow file: .github/workflows/labeler.yml#L32
The workflow is not valid. .github/workflows/labeler.yml (Line: 32, Col: 11): A sequence was not expected

Instead of:

apm-agent-python/.github/workflows/labeler.yml

Lines 31 to 33 in adff59c

	labels:
	- community
	- triage

it wants this:
https://github.com/elastic/apm-agent-nodejs/blob/f0b6a098db63ba7e21d7ab3febf3d739315746c8/.github/workflows/labeler.yml#L38-L40