Bump colorlog from 4.1.0 to 4.2.1 (#1854)

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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -2,7 +2,7 @@ aiohttp==3.6.2
 async_timeout==3.0.1
 attrs==19.3.0
 cchardet==2.1.6
-colorlog==4.1.0
+colorlog==4.2.1
 cpe==1.2.1
 cryptography==3.0
 docker==4.2.2