Bump typing from 3.7.4.1 to 3.7.4.3 (#1267)

requirements.in

@@ -15,6 +15,6 @@ mozilla_schema_generator==0.1.4
 GitPython==3.1.2
 cattrs==1.0.0
 attrs==19.3.0
-typing==3.7.4.1
+typing==3.7.4.3
 click==7.1.2
 incremental==17.5.0

requirements.txt

@@ -388,10 +388,9 @@ typing-extensions==3.7.4.2 \
     --hash=sha256:79ee589a3caca649a9bfd2a8de4709837400dfa00b6cc81962a1e6a1815969ae \
     --hash=sha256:f8d2bd89d25bc39dabe7d23df520442fa1d8969b82544370e03d88b5a591c392 \
     # via mypy
-typing==3.7.4.1 \
-    --hash=sha256:91dfe6f3f706ee8cc32d38edbbf304e9b7583fb37108fef38229617f8b3eba23 \
-    --hash=sha256:c8cabb5ab8945cd2f54917be357d134db9cc1eb039e59d1606dc1e60cb1d9d36 \
-    --hash=sha256:f38d83c5a7a7086543a0f649564d661859c5146a85775ab90c0d2f93ffaa9714 \
+typing==3.7.4.3 \
+    --hash=sha256:1187fb9c82fd670d10aa07bbb6cfcfe4bdda42d6fab8d5134f04e8c4d0b71cc9 \
+    --hash=sha256:283d868f5071ab9ad873e5e52268d611e851c870a2ba354193026f2dfb29d8b5 \
     # via -r requirements.in
 urllib3==1.25.9 \
     --hash=sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527 \