fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE315-BUSYBOX-2440607
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-3314629
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-3368753
- https://snyk.io/vuln/SNYK-ALPINE315-OPENSSL-5661569
- https://snyk.io/vuln/SNYK-ALPINE315-ZLIB-2976173

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.15.0
+FROM alpine:3.16.7
 
 ARG TARGETOS
 ARG TARGETARCH