fix: portfolio/upgraded-disco/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855502
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855503
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855507
- https://snyk.io/vuln/SNYK-DEBIAN12-CURL-7575306
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963

portfolio/upgraded-disco/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21 as builder
+FROM golang:1.23.0 as builder
 # Define build env
 ENV GOOS linux
 ENV CGO_ENABLED 0