Bump alpine from 3.12 to 3.16.2 in /core

Bumps alpine from 3.12 to 3.16.2.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

core/Dockerfile

@@ -1,5 +1,5 @@
 # syntax = docker/dockerfile:1.3
-FROM alpine:3.12
+FROM alpine:3.16.2
 
 #Add startup script to container
 COPY docker-entrypoint.sh /usr/local/bin/

core/Dockerfile.dev

@@ -1,5 +1,5 @@
 # syntax = docker/dockerfile:1.3
-FROM alpine:3.12
+FROM alpine:3.16.2
 
 #Add startup script to container
 COPY docker-entrypoint.sh /usr/local/bin/