fix(deezer): silence connection pool warnings by sizing the requests adapter correctly

[berettavexee]

Problem

When downloading albums or playlists concurrently, urllib3 logs repeated warnings:

WARNING  Connection pool is full, discarding connection: api.deezer.com. Connection pool size: 10

The deezer-py library uses a requests.Session with the default HTTPAdapter, whose pool_maxsize is 10. Streamrip calls deezer-py from multiple asyncio.to_thread() coroutines running in parallel — one per track being resolved — so the number of simultaneous HTTP connections to api.deezer.com easily exceeds the pool ceiling. urllib3 then discards the excess connections and logs a warning for each one.

Fix

Mount a custom HTTPAdapter on the deezer-py session with a pool_maxsize large enough to absorb concurrent API calls:

max_conn = config.session.downloads.max_connections
adapter = requests.adapters.HTTPAdapter(
    pool_connections=max_conn,
    pool_maxsize=max(max_conn * 4, 32),
    max_retries=0,
)
self.client.session.mount("https://", adapter)
self.client.session.mount("http://", adapter)

pool_maxsize is just a ceiling — urllib3 does not pre-allocate connections — so using max(max_connections × 4, 32) has no memory cost and ensures the pool is never exhausted under typical usage.

Idea from hank-bond/streamrip.

Test plan

• Download an album or playlist with concurrency = true → no connection pool warnings
• Works with default max_connections = 10 and with lower values (e.g. 3)

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