fix: remove invalid queueProducers schema

[TimoWilhelm]

What this PR solves / how to test

Fixes #5908.

The following commit changes the schema for queueProducers in miniflare but the zod schema still accepts the old Record<string, string> schema which will cause sending to the queue to fail with a non-descriptive error.
66bdad0#diff-0a38fa706f017d0142050f5bcd28eaed913461608cec13a4fa1461af12ff2d65L537

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 1a9183f

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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/9624887654/npm-package-wrangler-6128

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6128/npm-package-wrangler-6128

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9624887654/npm-package-wrangler-6128 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9624887654/npm-package-create-cloudflare-6128 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9624887654/npm-package-cloudflare-kv-asset-handler-6128

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9624887654/npm-package-miniflare-6128

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9624887654/npm-package-cloudflare-pages-shared-6128

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9624887654/npm-package-cloudflare-vitest-pool-workers-6128

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

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240610.1
workerd	1.20240610.1	1.20240610.1
workerd --version	1.20240610.1	2024-06-10

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