chore(api): bump etl to include slug-collision route index (#337)

[raymondjacobson]

Summary

Bumps github.com/OpenAudio/go-openaudio and .../pkg/etl from 5d2e19a (#901) to 43606e8 to consume go-openaudio #337.

That change adds ETL migration 0031, which indexes track_routes and playlist_routes on (owner_id, title_slug, collision_id). Slug-collision resolution runs SELECT MAX(collision_id) … WHERE owner_id AND title_slug on every track/playlist create + rename; today that's a full per-owner route scan (prod EXPLAIN: ~16k-row bitmap heap scan on every upload for a prolific owner), which is the multi-second Track (7.8s) / Playlist (44s) tail in core-indexer. The new index makes it an index-only lookup.

core-indexer runs this vendored audius/api image, so this bump is required to ship #337 to prod.

Changes

• go.mod / go.sum: both go-openaudio modules → v1.3.1-0.20260604005215-43606e8d8e5a

⚠️ Deploy note — pre-build the indexes CONCURRENTLY first

Migration 0031 builds the indexes non-concurrently (single-transaction migration runner), taking an ACCESS EXCLUSIVE lock on track_routes (~2M rows / 493 MB) on indexer boot. To avoid stalling route writes on deploy, pre-build them in prod first — IF NOT EXISTS then makes the migration a no-op (same pattern used to recover the 0030 indexes):

CREATE INDEX CONCURRENTLY IF NOT EXISTS track_routes_owner_title_slug_idx
  ON track_routes (owner_id, title_slug, collision_id);
CREATE INDEX CONCURRENTLY IF NOT EXISTS playlist_routes_owner_title_slug_idx
  ON playlist_routes (owner_id, title_slug, collision_id);

Test plan

• go mod tidy — only go.mod/go.sum changed
• go build ./... passes
• migration 0031 present in the resolved module
• Post-deploy: 0031 applied (or no-op if pre-built), and Track/Playlist max processing times drop in the indexer log analysis

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