Update docker/build-push-action digest to 1dc7386 (#386)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[docker/build-push-action](https://redirect.github.com/docker/build-push-action)
| action | digest | `14487ce` -> `1dc7386` |

---

### Configuration

📅 **Schedule**: 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 becomes conflicted, 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 was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/lettuce-financial/github-bot-signed-commit).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC4xMS4xOCIsInVwZGF0ZWRJblZlciI6IjQwLjExLjE4IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Author: lettuce-bot[bot]

.github/workflows/pull-request.yaml

@@ -15,7 +15,7 @@ jobs:
         uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2 # v3
 
       - name: Build container image
-        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6
+        uses: docker/build-push-action@1dc73863535b631f98b2378be8619f83b136f4a0 # v6
         with:
           context: .
           file: Dockerfile