Bump the actions group across 3 directories with 1 update

Bumps the actions group with 1 update in the /vertical-pod-autoscaler/pkg/admission-controller directory: golang.
Bumps the actions group with 1 update in the /vertical-pod-autoscaler/pkg/recommender directory: golang.
Bumps the actions group with 1 update in the /vertical-pod-autoscaler/pkg/updater directory: golang.


Updates `golang` from 1.25.7 to 1.26.1

Updates `golang` from 1.25.7 to 1.26.1

Updates `golang` from 1.25.7 to 1.26.1

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: golang
  dependency-version: 1.26.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: golang
  dependency-version: 1.26.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

vertical-pod-autoscaler/pkg/admission-controller/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM --platform=$BUILDPLATFORM golang:1.25.7 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.1 AS builder
 
 WORKDIR /workspace
 

vertical-pod-autoscaler/pkg/recommender/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM --platform=$BUILDPLATFORM golang:1.25.7 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.1 AS builder
 
 WORKDIR /workspace
 

vertical-pod-autoscaler/pkg/updater/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM --platform=$BUILDPLATFORM golang:1.25.7 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.1 AS builder
 
 WORKDIR /workspace