Update dependency @web/test-runner to v0.12.18

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@web/test-runner	0.12.17 -> 0.12.18

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Release Notes

modernweb-dev/web

### [`v0.12.18`](https://togithub.com/modernweb-dev/web/releases/@​web/test-runner@0.12.18) [Compare Source](https://togithub.com/modernweb-dev/web/compare/@web/test-runner@0.12.17...@web/test-runner@0.12.18) ##### Patch Changes - [`4c5fa2f`](https://togithub.com/modernweb-dev/web/commit/4c5fa2fe): coverageConfig now uses object spread to merge with defaults

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[github-actions[bot]]

size-limit report 📦

Path	Size
dist/react-reactions.cjs.production.min.js	53.8 KB (0%)
dist/react-reactions.esm.js	53.88 KB (0%)