Bump fonttools from 4.22.1 to 4.23.1

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.22.1 to 4.23.1.
- [Release notes](https://github.com/fonttools/fonttools/releases)
- [Changelog](https://github.com/fonttools/fonttools/blob/main/NEWS.rst)
- [Commits](fonttools/fonttools@4.22.1...4.23.1)

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

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ async-timeout==3.0.1      # via aiohttp
 attrs==21.2.0             # via aiohttp
 cffi==1.14.5              # via pycares
 chardet==3.0.4            # via aiohttp
-fonttools==4.22.1         # via fdiff (setup.py)
+fonttools==4.23.1         # via fdiff (setup.py)
 idna==3.1                # via yarl
 multidict==5.1.0          # via aiohttp, yarl
 pycares==4.0.0            # via aiodns