fix: tool/codegen/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-GIT-6846203
- https://snyk.io/vuln/SNYK-DEBIAN12-GIT-6846203
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-7411314
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-7411315

tool/codegen/Dockerfile

@@ -1,13 +1,13 @@
 # Builder image to build go program.
-FROM golang:1.22.4 as BUILDER
+FROM golang:1.23 as BUILDER
 
 COPY protoc-gen-auth /protoc-gen-auth
 RUN cd /protoc-gen-auth \
   && go build -o /usr/local/bin/protoc-gen-auth . \
   && chmod +x /usr/local/bin/protoc-gen-auth
 
 # Codegen image which is actually being used.
-FROM golang:1.22.4
+FROM golang:1.23
 
 # This is version of protobuf installed in the image.
 # See https://pkgs.alpinelinux.org/packages?name=protobuf&branch=v3.16