chore(deps): bump six from 1.14.0 to 1.15.0 (#224)

Author: dependabot[bot]

requirements-constraints.txt

@@ -69,9 +69,9 @@ cryptography==3.4.7 \
     --hash=sha256:7ec5d3b029f5fa2b179325908b9cd93db28ab7b85bb6c1db56b10e0b54235177 \
     --hash=sha256:ee77aa129f481be46f8d92a1a7db57269a2f23052d5f2433b4621bb457081cc9 \
     --hash=sha256:3d10de8116d25649631977cb37da6cbdd2d6fa0e0281d014a5b7d337255ca713
-six==1.14.0 \
-    --hash=sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c \
-    --hash=sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a
+six==1.15.0 \
+    --hash=sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced \
+    --hash=sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259
 cffi==1.14.0 \
     --hash=sha256:1cae98a7054b5c9391eb3249b86e0e99ab1e02bb0cc0575da191aedadbdf4384 \
     --hash=sha256:cf16e3cf6c0a5fdd9bc10c21687e19d29ad1fe863372b5543deaec1039581a30 \