Update dependency boto3 to v1.9.64 (#2760)

renovate[bot] · takirala · commit 35ee35068ab5 · 2018-12-13T14:50:46.000-08:00
diff --git a/frozen_requirements.txt b/frozen_requirements.txt
@@ -33,7 +33,7 @@ azure-nspkg==3.0.2
 azure-storage==0.36.0
 bcrypt==3.1.4
 black==18.9b0
-boto3==1.9.23
+boto3==1.9.64
 botocore==1.12.64
 cached-property==1.5.1
 cachetools==2.1.0
