chore(deps): bump golang from 1.26.2-bookworm to 1.26.3-bookworm in /e2e (#6327)

Bumps golang from 1.26.2-bookworm to 1.26.3-bookworm.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26.3-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>

e2e/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.26.2-bookworm@sha256:47ce5636e9936b2c5cbf708925578ef386b4f8872aec74a67bd13a627d242b19 AS builder
+FROM golang:1.26.3-bookworm@sha256:252599aeb51ad60b83e4d8821802068127c528c707cb7dd7afd93be057c6011c AS builder
 RUN go install github.com/onsi/ginkgo/v2/ginkgo@v2.1.6
 
 FROM alpine:3.23.4@sha256:5b10f432ef3da1b8d4c7eb6c487f2f5a8f096bc91145e68878dd4a5019afde11