chore(deps): update dependency go to v1.26.0

Author: renovate[bot]

.github/workflows/codeql-analysis.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: 1.25.7 # golang-version:go
+          go-version: 1.26.0 # golang-version:go
           check-latest: true
 
       - name: Initialize CodeQL

.github/workflows/publish.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: 1.25.7 # golang-version:go
+          go-version: 1.26.0 # golang-version:go
           check-latest: true
 
       - name: OCI Metadata for multi-arch image

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v6
         with:
-          go-version: 1.25.7 # golang-version:go
+          go-version: 1.26.0 # golang-version:go
           check-latest: true
 
       - name: Lint

go.mod

@@ -2,7 +2,7 @@ module github.com/sickhub/mailu-operator
 
 go 1.25.0
 
-toolchain go1.25.7
+toolchain go1.26.0
 
 require (
 	github.com/oapi-codegen/runtime v1.1.2