fix: duplicate soundfile entry and redundant sniffio in requirements.txt

[kuishou68]

Problem

requirements.txt lists soundfile>=0.13.1 twice (lines ~11 and ~24). Duplicate dependency declarations can cause confusion with package managers and pip-compile tools, and may lead to version conflicts if the two entries are ever set to different constraints.

Additionally, sniffio is listed as a bare unpinned dependency but it is a transitive dependency of anyio/httpx already pinned in the file — it does not need to be listed separately.

Steps to Reproduce

grep soundfile requirements.txt

Outputs:

soundfile>=0.13.1
soundfile>=0.13.1

Expected

soundfile should appear exactly once in requirements.txt.

Fix

Remove the duplicate soundfile>=0.13.1 line.

[kuishou68]

I've opened PR #issue-471-remove-duplicate-soundfile (createPullRequest) to fix this issue.

[kuishou68]

I've opened PR #472 to fix this issue.