ci: use Go 1.25 in workflows and Dockerfile

The module requires Go 1.25. The workflows and the Dockerfile used older versions.

.github/workflows/ci.yaml

@@ -18,5 +18,5 @@ jobs:
   pr-checks:
     uses: lukaszraczylo/shared-actions/.github/workflows/go-pr.yaml@main
     with:
-      go-version: "1.21"
+      go-version: "1.25"
     secrets: inherit

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
   release:
     uses: lukaszraczylo/shared-actions/.github/workflows/go-release.yaml@main
     with:
-      go-version: "1.23"
+      go-version: "1.25"
       docker-enabled: true
     secrets: inherit
 

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.21 as builder
+FROM golang:1.25 AS builder
 ARG TARGETOS
 ARG TARGETARCH