chore(deps): bump golang from 1.25.0-bookworm to 1.25.1-bookworm in /e2e (#5280)

Bumps golang from 1.25.0-bookworm to 1.25.1-bookworm.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.25.1-bookworm
  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>
Co-authored-by: Moritz Johner <moolen@users.noreply.github.com>

e2e/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.25.0-bookworm@sha256:81dc45d05a7444ead8c92a389621fafabc8e40f8fd1a19d7e5df14e61e98bc1a AS builder
+FROM golang:1.25.1-bookworm@sha256:6ad9415c04f1cdb7888141cb247cabb28fa74fcc597034494c65d5bc783246a0 AS builder
 
 ENV KUBECTL_VERSION="v1.28.3"
 ENV HELM_VERSION="v3.13.1"