test: update test-cluster-worker-events to use arrow functions.

[Ev-Abbott]

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[digitalinfinity]

@AbbottEverett thanks for your PR- the change itself looks good to me but your git config needs a little tweak. Can you run the following command to set your email in your git config:
git config user.email "MY_NAME@example.com"

Then run git commit --amend --reset-author and push again
This is so that you're credited correctly for this PR (for instance, your github badge will change from "First time contributor" to "Contributor" once this PR lands if your email is correct)

(thanks to @gireeshpunthil for this tip!)

[Ev-Abbott]

Thanks for the advice @digitalinfinity. I made the changes and pushed to this branch.

[jasnell]

Just a nit: for top level functions like this, using the function check(m) { form is preferred. The arrow functions on the event handlers is fine.

[Trott]

CI: https://ci.nodejs.org/job/node-test-pull-request/17800

[Trott]

Collaborators, please 👍 here to fast-track.

[Trott]

Landed in 3989785.

Thanks for the contribution! 🎉

(If you're interested in other possible contributions to Node.js but don't have a good idea of where to start looking, some ideas are posted at https://www.nodetodo.org/next-steps/.)