fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE313-BUSYBOX-1920751
- https://snyk.io/vuln/SNYK-ALPINE313-BUSYBOX-1920752
- https://snyk.io/vuln/SNYK-ALPINE313-BUSYBOX-1920759
- https://snyk.io/vuln/SNYK-ALPINE313-BUSYBOX-1920760
- https://snyk.io/vuln/SNYK-ALPINE313-ZLIB-2976175

Dockerfile

@@ -59,7 +59,7 @@ RUN npm run build
 # --------------------------------------------------------------------------------
 
 FROM node:16.8.0-alpine as production
-FROM node:16.9-alpine as production
+FROM node:16.20.1-alpine as production
 
 # Let's make our home
 WORKDIR /usr/src/docs