Update pipeline_definitions to target go v1.23

Author: takoverflow

.ci/pipeline_definitions

@@ -30,11 +30,11 @@ autoscaler:
             dockerfile: './cluster-autoscaler/Dockerfile'
     steps:
       test:
-        image: 'golang:1.22.2'
+        image: 'golang:1.23.2'
       check:
-        image: 'golang:1.22.2'
+        image: 'golang:1.23.2'
       build:
-        image: 'golang:1.22.2'
+        image: 'golang:1.23.2'
         output_dir: 'binary'
   jobs:
     head-update:
@@ -137,9 +137,9 @@ vertical-pod-autoscaler:
             dir: 'vertical-pod-autoscaler'
     steps:
       test:
-        image: 'golang:1.22.2'
+        image: 'golang:1.23.2'
       build:
-        image: 'golang:1.22.2'
+        image: 'golang:1.23.2'
         output_dir: 'binary'
   jobs:
     release:
@@ -167,4 +167,4 @@ vertical-pod-autoscaler:
           channel_cfgs:
             internal_scp_workspace:
               channel_name: 'C017KSLTF4H' # gardener-autoscaling
-              slack_cfg_name: 'scp_workspace'
+              slack_cfg_name: 'scp_workspace'