chore(deps): bump ccxt from 4.5.39 to 4.5.40

Bumps [ccxt](https://github.com/ccxt/ccxt) from 4.5.39 to 4.5.40.
- [Release notes](https://github.com/ccxt/ccxt/releases)
- [Commits](https://github.com/ccxt/ccxt/compare/v4.5.39...v4.5.40)

---
updated-dependencies:
- dependency-name: ccxt
  dependency-version: 4.5.40
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -7,7 +7,7 @@ ft-pandas-ta==0.3.16
 ta-lib==0.6.8
 technical==1.5.4
 
-ccxt==4.5.39
+ccxt==4.5.40
 cryptography==46.0.5
 aiohttp==3.13.3
 SQLAlchemy==2.0.46