Bump ccxt from 2.8.98 to 2.9.4

Bumps [ccxt](https://github.com/ccxt/ccxt) from 2.8.98 to 2.9.4.
- [Release notes](https://github.com/ccxt/ccxt/releases)
- [Changelog](https://github.com/ccxt/ccxt/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ccxt/ccxt/compare/2.8.98...2.9.4)

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

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

requirements.txt

@@ -2,7 +2,7 @@ numpy==1.24.2
 pandas==1.5.3
 pandas-ta==0.3.14b
 
-ccxt==2.8.98
+ccxt==2.9.4
 cryptography==39.0.2
 aiohttp==3.8.4
 SQLAlchemy==2.0.5.post1