Bump uvloop from 0.20.0 to 0.21.0 (#80)

Bumps [uvloop](https://github.com/MagicStack/uvloop) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/MagicStack/uvloop/releases)
- [Commits](MagicStack/uvloop@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: uvloop
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -2,6 +2,6 @@ aiogram==3.13.1
 sulguk==0.8.0
 pydantic-settings==2.6.0
 pyaml==24.9.0
-uvloop==0.20.0; sys_platform == 'linux'
+uvloop==0.21.0; sys_platform == 'linux'
 structlog==24.4.0
 orjson==3.10.7