fix: bumped hls.js version

[spuppo-mux]

Closes https://github.com/muxinc/devextravaganza/issues/290

Fixes subtitles rendering at the wrong time on assets that contain an EXT-X-DISCONTINUITY. Cues are shifted forward by the start time of the first subtitle fragment loaded after the discontinuity, so they either appear at the wrong moment or land past the end of the video and never show at all.

Related hlsjs links:

• Issue#4888: Cue offset is not being calculated correctly when stream is played from a non-zero continuity segment
• Issue#7850: Possible bug in TimelineController._parseVTTs: VTT fragments parsed with undefined initPTS when maxAvCC > -1, causing subtitle gap after SSAI discontinuities
• PR#7852: Align WebVTT segments missing X-TIMESTAMP-MAP header with media timestamps

Also in this PR

• min-cap-level-controller.ts: HlsConfig.capLevelController became optional in 1.7, so class … extends Hls.DefaultConfig.capLevelController now fails. Kept the value on DefaultConfig and narrowed the type; importing CapLevelController by name would compile but break the CJS bundle, since dist/hls.js (UMD) exports only the Hls class; the named exports exist only in dist/hls.mjs.

---

Note

Medium Risk
This is a minor-version bump of the core HLS engine used for adaptive streaming and subtitles, so regressions in playback, ABR, or caption sync are possible despite the targeted bugfix motivation.

Overview
Upgrades hls.js from ~1.6.15 to ~1.7.0 across the monorepo (@mux/playback-core as a runtime dependency; mux-audio, mux-player, mux-video as dev deps), with lockfile hoisting to a single hls.js@1.7.3. The intent is to pick up upstream fixes for WebVTT cue timing on streams with EXT-X-DISCONTINUITY (cues no longer shifted or dropped after SSAI-style breaks).

min-cap-level-controller.ts is adjusted because hls.js 1.7 types Hls.DefaultConfig.capLevelController as optional: the controller base class is asserted/narrowed and a defensive runtime check logs if it is missing (still sourced from DefaultConfig for CJS bundle compatibility).

playback-core tests for initial-estimate-segments now stub fragments with sn: 0 so hls.js 1.7’s stricter fragmentsAreEqual handling does not throw before custom listeners run.

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