Fix remaining ESLINT issue

I added the .eslintrc.json file with the rule exception and seemed to work:

{
    "rules": {
        "yml/no-empty-mapping-value": [
            "off"
        ]
    }
}

https://git.drupalcode.org/project/google_calendar_service/-/pipelines/4...

I'll merge it in the 3.0.x branch and include it in a next release, along with other fixes.

I guess practice makes perfection, sorry :)

I didn't see any input / objections between yesterday and today, so I'll move this to "Fixed" and probably be included in the next tag release.

Automatically closed - issue fixed for 2 weeks with no activity.