add eof on template.yml

[4geru]

Thanks to create great nextjs analizer.
My project introduced this github action.

Run npx -p nextjs-bundle-analysis generate to generate the file,
but the eof was missing. eof was missing in the original template file, so added it.

[hashicorp-cla]

All committers have signed the CLA.

[4geru]

@jescalan please review this pull request 🙇

[jescalan]

Is there any specific reason that this is needed?

[4geru]

I add this template in my project and linter detect to add eof line.