chore: update miniflare and @cloudflare/workers-types

[sam-goodwin]

Updates the repo's Cloudflare toolchain pins:

• miniflare: 4.20260329.0 → 4.20260708.1 (root catalog) and 4.20260424.0 → 4.20260708.1 (alchemy package dependency)
• @cloudflare/workers-types: ^4.20260602.1 → ^5.20260708.1 (root catalog; new major released July 2026)

// package.json (workspace catalog)
"catalog": {
  "@cloudflare/workers-types": "^5.20260708.1",
  "miniflare": "4.20260708.1",
  // ...
}

Verification

• bun tsc -b passes for the entire workspace (alchemy package, examples, templates) on workers-types v5 — no type breakage from the major bump.
• alchemy/test/cloudflare/miniflare.test.ts (remote R2 bucket over the local miniflare proxy) passes on miniflare 4.20260708.1.
• worker.test.ts "json bindings are injected as native types" and "create and test worker with Artifacts binding" pass against real Cloudflare with the updated deps.

Note: even workers-types v5 still ships the stale ArtifactsRepo interface (plain data properties, no info() method) that doesn't match the deployed Artifacts runtime, which now returns a JS-RPC handle. That's an upstream types gap — worth reporting to Cloudflare separately.

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