Update boto3 requirement from ~=1.16.47 to ~=1.16.50 (#704)

dependabot[bot] · web-flow · commit 620f334c07f0 · 2021-01-07T14:37:57.000+01:00
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
@@ -1,4 +1,4 @@
-boto3~=1.16.47
+boto3~=1.16.50
 cryptography==3.3.1
 marshmallow==3.10.0
 packaging==20.8
