Docker file Alpine version changed to 3.13

Dockerfile

@@ -1,5 +1,5 @@
 # Container image that runs your code
-FROM alpine:3.10
+FROM alpine:3.13
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY entrypoint.sh /entrypoint.sh
@@ -12,4 +12,4 @@ RUN apk add --no-cache openssh
 
 
 # Code file to execute when the docker container starts up (`entrypoint.sh`)
-ENTRYPOINT ["/entrypoint.sh"]
+ENTRYPOINT ["/entrypoint.sh"]