fix: update to latest `@nuxt/module-builder`

[danielroe]

Previous versions of @nuxt/module-builder produced incorrect types for files in the runtime/ directory. Specifically, a .d.ts declaration paired with a .mjs file. This isn't correct - it should be either .d.mts and .mjs or .d.ts and .js.

For maximum compatibility, @nuxt/module-builder v0.8 switched to .js extension for files in runtime/ directory.

With the latest Nuxt, this is now an error that removes correct plugin injection types.

Related PRs: https://github.com/nuxt/nuxt/pull/28480, https://github.com/nuxt/nuxt/pull/28593 See also https://github.com/nuxt/nuxt/issues/28672.

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