build(deps): bump discord-py from 2.5.2 to 2.6.0

Bumps [discord-py](https://github.com/Rapptz/discord.py) from 2.5.2 to 2.6.0.
- [Commits](Rapptz/discord.py@v2.5.2...v2.6.0)

---
updated-dependencies:
- dependency-name: discord-py
  dependency-version: 2.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-discord.py==2.5.2
+discord.py==2.6.0
 Pillow==11.3.0
 xkcd==2.4.2
 pytz==2025.2