Bump colorlog from 4.1.0 to 4.2.1

Bumps [colorlog](https://github.com/borntyping/python-colorlog) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/borntyping/python-colorlog/releases)
- [Commits](https://github.com/borntyping/python-colorlog/compare/v4.1.0...v4.2.1)

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

setup.py

@@ -13,7 +13,7 @@ dependencies = [
     "aiosqlite==0.15.0",  # asyncio wrapper for sqlite, to store blocks
     "bitstring==3.1.7",  # Binary data management library
     "cbor2==5.1.0",  # Used for network wire format
-    "colorlog==4.1.0",  # Adds color to logs
+    "colorlog==4.2.1",  # Adds color to logs
     "concurrent-log-handler==0.9.16",  # Concurrently log and rotate logs
     "cryptography==3.0", #Python cryptography library for TLS
     "keyring==21.3.0",  # Store keys in MacOS Keychain, Windows Credential Locker