fix: examples/radix-example-oauth-proxy/api/Dockerfile to reduce vuln…

…erabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-UPSTREAM-NODE-6252332
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-6148880
- https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-6148880
- https://snyk.io/vuln/SNYK-UPSTREAM-NODE-6252328
- https://snyk.io/vuln/SNYK-UPSTREAM-NODE-6564548

examples/radix-example-oauth-proxy/api/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:18-alpine3.17
+FROM node:20.8.0-alpine3.17
 
 # Create app directory
 WORKDIR /app