ci: run tests on macos 13 rather than latest

[petebacondarwin]

What this PR solves / how to test

Fixes #[insert GH or internal issue number(s)].

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• Changeset (Changeset guidelines)
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• Public documentation
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  • Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/...
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[changeset-bot]

⚠️ No Changeset found

Latest commit: 721895c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-wrangler-5828

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5828/npm-package-wrangler-5828

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-wrangler-5828 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-create-cloudflare-5828 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-cloudflare-kv-asset-handler-5828

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-miniflare-5828

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-cloudflare-pages-shared-5828

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9084543808/npm-package-cloudflare-vitest-pool-workers-5828

Note that these links will no longer work once the GitHub Actions artifact expires.

---

wrangler@3.55.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240419.1
workerd	1.20240512.0	1.20240512.0
workerd --version	1.20240512.0	2024-05-12

Please ensure constraints are pinned, and miniflare/workerd minor versions match.