Bump ccxt from 4.1.39 to 4.1.40

Bumps [ccxt](https://github.com/ccxt/ccxt) from 4.1.39 to 4.1.40.
- [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/4.1.39...4.1.40)

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

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

requirements.txt

@@ -2,7 +2,7 @@ numpy==1.26.1
 pandas==2.1.2
 pandas-ta==0.3.14b
 
-ccxt==4.1.39
+ccxt==4.1.40
 cryptography==41.0.5
 aiohttp==3.8.6
 SQLAlchemy==2.0.22