fix: Dockerfile to reduce vulnerabilities (#9)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE314-LIBRETLS-2432985

Co-authored-by: Rui Costa <44004884+rui-costa@users.noreply.github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # Container image that runs your code
-FROM alpine:3.15
+FROM alpine:latest
 RUN apk update
 RUN apk add git
 RUN apk add curl