Bump ccxt from 4.5.18 to 4.5.20

Bumps [ccxt](https://github.com/ccxt/ccxt) from 4.5.18 to 4.5.20.
- [Release notes](https://github.com/ccxt/ccxt/releases)
- [Changelog](https://github.com/ccxt/ccxt/blob/master/exchanges.cfg)
- [Commits](ccxt/ccxt@v4.5.18...v4.5.20)

---
updated-dependencies:
- dependency-name: ccxt
  dependency-version: 4.5.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements_with_versions.txt

@@ -81,7 +81,7 @@ Unidecode==1.4.0
 Ball==0.2.9
 pynput==1.8.1
 gTTS==2.5.4
-ccxt==4.5.18
+ccxt==4.5.20
 fitz==0.0.1.dev2
 fastapi==0.121.1
 Django==5.2.7