Bump ccxt from 1.27.1 to 1.27.20

Bumps [ccxt](https://github.com/ccxt/ccxt) from 1.27.1 to 1.27.20.
- [Release notes](https://github.com/ccxt/ccxt/releases)
- [Changelog](https://github.com/ccxt/ccxt/blob/master/doc/exchanges-by-country.rst)
- [Commits](https://github.com/ccxt/ccxt/compare/1.27.1...1.27.20)

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

requirements-common.txt

@@ -1,6 +1,6 @@
 # requirements without requirements installable via conda
 # mainly used for Raspberry pi installs
-ccxt==1.27.1
+ccxt==1.27.20
 SQLAlchemy==1.3.16
 python-telegram-bot==12.6.1
 arrow==0.15.5