Merge pull request #1732 from python-trio/dependabot/pip/cffi-1.14.3

Author: dependabot-preview[bot]

test-requirements.txt

@@ -11,7 +11,7 @@ async-generator==1.10     # via -r test-requirements.in
 attrs==20.2.0             # via -r test-requirements.in, outcome, pytest
 backcall==0.2.0           # via ipython
 black==20.8b1 ; implementation_name == "cpython"  # via -r test-requirements.in
-cffi==1.14.2              # via cryptography
+cffi==1.14.3              # via cryptography
 click==7.1.2              # via black
 coverage==5.3             # via pytest-cov
 cryptography==3.1         # via pyopenssl, trustme