Upgrade: Update frozenlist requirement from >=1.7.0 to >=1.8.0

Updates the requirements on [frozenlist](https://github.com/aio-libs/frozenlist) to permit the latest version.
- [Release notes](https://github.com/aio-libs/frozenlist/releases)
- [Changelog](https://github.com/aio-libs/frozenlist/blob/master/CHANGES.rst)
- [Commits](aio-libs/frozenlist@v1.7.0...v1.8.0)

---
updated-dependencies:
- dependency-name: frozenlist
  dependency-version: 1.8.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -10,7 +10,7 @@ certifi>=2026.4.22
 charset-normalizer>=3.4.7
 discord.py>=2.6.3
 filelock>=3.29.0
-frozenlist>=1.7.0
+frozenlist>=1.8.0
 idna>=3.14
 multidict>=6.7.1
 propcache>=0.5.2