chore: Bump golang version to 1.23.2 (#266)

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**Description**

Changes proposed in this pull request:

- Bump golang versions for build img layer and tests to latest 1.23.2

**Related issue(s)**
<!-- If you refer to a particular issue, provide its number. For
example, `Resolves #123`, `Fixes #43`, or `See also #33`. -->

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.22.7-alpine as builder
+FROM golang:1.23.2-alpine as builder
 ARG TARGETOS
 ARG TARGETARCH
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/kyma-project/template-operator
 
-go 1.22.4
+go 1.23.2
 
 replace github.com/kyma-project/template-operator/api => ./api