Bump golang from 1.26.0 to 1.26.1 (#1727)

Bumps golang from 1.26.0 to 1.26.1.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 ############# builder
-FROM --platform=$BUILDPLATFORM golang:1.26.0 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.1 AS builder
 
 WORKDIR /go/src/github.com/gardener/gardener-extension-provider-aws