Update go to 1.26

Author: gardener-ci-robot

.github/workflows/build.yaml

@@ -45,7 +45,7 @@ jobs:
       - uses: gardener/cc-utils/.github/actions/setup-git-identity@master
       - uses: actions/setup-go@v6
         with:
-          go-version: '1.25'
+          go-version: '1.26'
       - name: run-verify
         shell: bash
         run: |

Dockerfile

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Build the manager binary
-FROM golang:1.25.5 AS builder
+FROM golang:1.26.0 AS builder
 ARG TARGETOS
 ARG TARGETARCH