Bump ccxt from 3.1.44 to 4.3.50 #737

Job	Run time
build-linux (ubuntu-20.04, 3.9)	1m 10s
build-macos (macos-latest, 3.9)	1s
build-linux (ubuntu-20.04, 3.10)	1m 15s
build-windows (windows-latest, 3.9)	45s
build-macos (macos-latest, 3.10)	1s
build-linux-online	10m 39s
build-linux (ubuntu-20.04, 3.11)	1m 21s
build-windows (windows-latest, 3.10)	1m 0s
build-macos (macos-latest, 3.11)	1s
build-linux (ubuntu-20.04, 3.12)	1m 10s
build-windows (windows-latest, 3.11)	55s
build-macos (macos-latest, 3.12)	1s
build-linux (ubuntu-22.04, 3.9)	1m 16s
docs-check	20s
build-windows (windows-latest, 3.12)	48s
build-macos (macos-13, 3.9)	57s
build-linux (ubuntu-22.04, 3.10)	1m 27s
build-macos (macos-13, 3.10)	1m 21s
build-linux (ubuntu-22.04, 3.11)	1m 26s
build-macos (macos-13, 3.11)	58s
mypy-version-check	4s
pre-commit	57s
build-linux (ubuntu-22.04, 3.12)	1m 26s
build-macos (macos-13, 3.12)	1s
build-macos (macos-14, 3.10)	1m 2s
build-macos (macos-14, 3.11)	45s
build-macos (macos-14, 3.12)	1s
Build	0s
deploy-docker	0s
Deploy to PyPI	0s
Deploy Docker	0s
notify-complete	0s
	31m 8s

Provide feedback