chore(deps): bump gdown in /plugins/model/tts-cosevoice (#6747)

Bumps [gdown](https://github.com/wkentaro/gdown) from 5.1.0 to 5.2.2.
- [Release notes](https://github.com/wkentaro/gdown/releases)
- [Commits](https://github.com/wkentaro/gdown/compare/v5.1.0...v5.2.2)

---
updated-dependencies:
- dependency-name: gdown
  dependency-version: 5.2.2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

plugins/model/tts-cosevoice/requirements.txt

@@ -2,7 +2,7 @@
 conformer==0.3.2
 conformer==0.3.2
 deepspeed==0.15.1; sys_platform == 'linux'
 deepspeed==0.15.1; sys_platform == 'linux'
 diffusers==0.27.2
 diffusers==0.27.2
-gdown==5.1.0
+gdown==5.2.2
 gradio==5.11.0
 gradio==5.11.0
 grpcio==1.57.0
 grpcio==1.57.0
 grpcio-tools==1.57.0
 grpcio-tools==1.57.0