fix: add missing undici dependency

[jackwilsdon]

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• I have read the contributing guidelines.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Describe your changes

Adds missing dependency on undici. Normally this being missing isn't an issue as it's listed in package-lock.json, but npm prune on Node.js 24 and above appears to remove it because it's not depended on at the top level. I think it also just makes sense to add this, as multi-scrobbler does depend on it:

multi-scrobbler/src/backend/sources/PlexApiSource.ts

Line 17 in 8f66914

import { Agent } from 'undici';

multi-scrobbler/src/backend/sources/PlexApiSource.ts

Line 138 in 8f66914

const bypassAgent = new Agent({

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