chore(deps)(deps): bump whisper-rs from 0.11.1 to 0.15.1

Bumps whisper-rs from 0.11.1 to 0.15.1.

---
updated-dependencies:
- dependency-name: whisper-rs
  dependency-version: 0.15.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -63,7 +63,7 @@ slack-morphism = { version = "2", optional = true, features = ["hyper"] }
 # matrix-sdk = { version = "0.7", optional = true, default-features = false, features = ["native-tls"] }
 
 # Voice transcription (optional)
-whisper-rs = { version = "0.11", optional = true }
+whisper-rs = { version = "0.15", optional = true }
 symphonia = { version = "0.5", optional = true, features = ["ogg", "pcm", "mp3", "wav"] }
 hound = { version = "3.5", optional = true }