chore(deps): update golang:1.26.3 docker digest to cc9a5d7 (open-component-model#2577)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| golang | stage | digest | `313faae` → `cc9a5d7` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the [Dependency
Dashboard](..open-component-model/issues/331) for more information.

---

### Configuration

📅 **Schedule**: (UTC)

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

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **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 [Mend
Renovate](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xODYuMiIsInVwZGF0ZWRJblZlciI6IjQzLjE4Ni4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Co-authored-by: ocmbot[bot] <125909804+ocmbot[bot]@users.noreply.github.com>

Author: ocmbot[bot]

kubernetes/controller/Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM --platform=${BUILDPLATFORM} golang:1.26.3@sha256:313faae491b410a35402c05d35e7518ae99103d957308e940e1ae2cfa0aac29b AS builder
+FROM --platform=${BUILDPLATFORM} golang:1.26.3@sha256:cc9a5d7a008cfe2cbc7ffc752b0d6636ad30fc16e4a648d2e4aac00fd8b25ca3 AS builder
 ARG TARGETOS
 ARG TARGETARCH