Bump ccxt from 1.40.14 to 1.40.25

Bumps [ccxt](https://github.com/ccxt/ccxt) from 1.40.14 to 1.40.25.
- [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/1.40.14...1.40.25)

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

requirements.txt

@@ -1,7 +1,7 @@
 numpy==1.19.4
 pandas==1.2.0
 
-ccxt==1.40.14
+ccxt==1.40.25
 aiohttp==3.7.3
 SQLAlchemy==1.3.22
 python-telegram-bot==13.1