Update golang to 1.23.6

I also did a go mod download and go mod tidy in each of the
directories with a go.mod file but no changes showed up (as expected
I guess).

Choosing this version since that's what we use for the cli
currently.

Ref: https://issues.redhat.com/browse/EC-1259

Author: simonbaird

.tool-versions

@@ -1 +1 @@
-golang 1.22.7
+golang 1.23.6

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM docker.io/library/golang:1.22.7 as builder
+FROM docker.io/library/golang:1.23.6 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests

api/go.mod

@@ -1,6 +1,6 @@
 module github.com/enterprise-contract/enterprise-contract-controller/api
 
-go 1.22 // allow
+go 1.23 // allow
 
 require (
 	k8s.io/apiextensions-apiserver v0.29.11

go.mod

@@ -1,6 +1,6 @@
 module github.com/enterprise-contract/enterprise-contract-controller
 
-go 1.22.7
+go 1.23.6
 
 require (
 	github.com/enterprise-contract/enterprise-contract-controller/api v0.0.0-00010101000000-000000000000

schema/go.mod

@@ -1,6 +1,6 @@
 module github.com/enterprise-contract/enterprise-contract-controller/schema
 
-go 1.22.7
+go 1.23.6
 
 require (
 	github.com/enterprise-contract/enterprise-contract-controller/api v0.1.35

tools/go.mod

@@ -1,6 +1,6 @@
 module github.com/enterprise-contract/enterprise-contract-controller/tools
 
-go 1.22.7
+go 1.23.6
 
 require (
 	github.com/elastic/crd-ref-docs v0.1.0