Bump ccxt from 2.7.12 to 2.7.45

Bumps [ccxt](https://github.com/ccxt/ccxt) from 2.7.12 to 2.7.45.
- [Release notes](https://github.com/ccxt/ccxt/releases)
- [Changelog](https://github.com/ccxt/ccxt/blob/master/exchanges.cfg)
- [Commits](https://github.com/ccxt/ccxt/compare/2.7.12...2.7.45)

---
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==1.24.1
 pandas==1.5.3
 pandas-ta==0.3.14b
 
-ccxt==2.7.12
+ccxt==2.7.45
 # Pin cryptography for now due to rust build errors with piwheels
 cryptography==38.0.1; platform_machine == 'armv7l'
 cryptography==39.0.0; platform_machine != 'armv7l'