Bump baseimage and PyYAML to fix CVEs

Change-Id: I6584860f11330bcba55be50251df83bcfe05d58a
Related-PROD: PRODX-23021
diff --git a/Dockerfile b/Dockerfile
index 91472ef..6afde1a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-FROM python:3.9.1-alpine3.13
+FROM python:3.9.12-alpine3.15
 
-LABEL build_date="2022-04-13"
+LABEL build_date="2022-05-13"
 
 WORKDIR /app
 ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1