chore(deps): update golang:1.26.2 docker digest to e1203b8 (#905)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [golang](https://hub.docker.com/_/golang) ([source](https://github.com/docker-library/golang)) | final | digest | `3e677b9` → `e1203b8` |

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - At any time (no schedule defined)
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xMjYuMCIsInVwZGF0ZWRJblZlciI6IjQzLjEyNi4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Reviewed-on: #905
Co-authored-by: Renovate Bot <renovate@unbound.se>
Co-committed-by: Renovate Bot <renovate@unbound.se>

Dockerfile

@@ -1,4 +1,4 @@
-FROM amd64/golang:1.26.2@sha256:3e677b9776e5fcb030321772b4fe13c58b22b8abe772c647be8f746159d1a2dc as build
+FROM amd64/golang:1.26.2@sha256:e1203b85dbf84b1959b973cf4007c8cc92b9af829f3fae75c0f3ba5053cd9500 as build
 WORKDIR /build
 ENV CGO_ENABLED=0
 ADD . /build