Bump pycares from 3.2.3 to 4.0.0

Bumps [pycares](https://github.com/saghul/pycares) from 3.2.3 to 4.0.0.
- [Release notes](https://github.com/saghul/pycares/releases)
- [Changelog](https://github.com/saghul/pycares/blob/master/ChangeLog)
- [Commits](saghul/pycares@pycares-3.2.3...pycares-4.0.0)

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

Author: dependabot[bot]

requirements.txt

@@ -14,7 +14,7 @@ chardet==3.0.4            # via aiohttp
 fonttools==4.22.1         # via fdiff (setup.py)
 idna==3.1                # via yarl
 multidict==5.1.0          # via aiohttp, yarl
-pycares==3.2.3            # via aiodns
+pycares==4.0.0            # via aiodns
 pycparser==2.20           # via cffi
 typing-extensions==3.10.0.0  # via aiohttp
 yarl==1.6.3               # via aiohttp