Pin dependencies (#1)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://code.forgejo.org/actions/checkout) | action | pinDigest |  -> `b4ffde6` |
| git.snaile.de/snailed/xbps-builder | container | pinDigest |  -> `c69bcb9` |

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### Configuration

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

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Reviewed-on: #1
Co-authored-by: Johnny5 <bot@snaile.de>
Co-committed-by: Johnny5 <bot@snaile.de>

.forgejo/workflows/build.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   build-and-publish:
     runs-on: docker
-    container: git.snaile.de/snailed/xbps-builder:2024.4.2019
+    container: git.snaile.de/snailed/xbps-builder:2024.4.2019@sha256:c69bcb9da724a31d9c1fff36fa6dc8f363b2d9f2470d3ec7887a0905c84b66ea
     env:
       LICENSE: "GPL-2.0"
       SHORT_DESCRIPTION: "Customized dwmblocks-async"
@@ -19,7 +19,7 @@ jobs:
       ARCH: "x86_64"
     steps:
       - name: Checkout
-        uses: https://code.forgejo.org/actions/checkout@v4
+        uses: https://code.forgejo.org/actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
         with:
           submodules: true