Update images digests (#713)

Update images digests

```release-note
NONE
```


## Changes
<details>

```diff
diff --git a/.github/workflows/mega-module.yaml b/.github/workflows/mega-module.yaml
index e4224f2..e739f9f 100644
--- a/.github/workflows/mega-module.yaml
+++ b/.github/workflows/mega-module.yaml
@@ -103,7 +103,7 @@ jobs:
       working-directory: images
       env:
         TF_VAR_target_repository: localhost:5005/tf-apko
-        APKO_IMAGE: ghcr.io/wolfi-dev/apko:latest@sha256:c4d530529f975d14cf2ab5941ccb56e74e5d6e114ce8f204f87a59cb5fa4bfe1
+        APKO_IMAGE: ghcr.io/wolfi-dev/apko:latest@sha256:c20fefe91b5e73c98e7347603d9ade099fa35438d395af518217a6550d9443d2
       run: |
         # Now change to our custom apko provider, note it may have a
         # digest drift w.r.t. imagetest sandbox digests, but the above
```

</details>

Co-authored-by: mattmoor <[email protected]>

Author: octo-sts[bot]

.github/workflows/mega-module.yaml

@@ -103,7 +103,7 @@ jobs:
       working-directory: images
       env:
         TF_VAR_target_repository: localhost:5005/tf-apko
-        APKO_IMAGE: ghcr.io/wolfi-dev/apko:latest@sha256:c4d530529f975d14cf2ab5941ccb56e74e5d6e114ce8f204f87a59cb5fa4bfe1
+        APKO_IMAGE: ghcr.io/wolfi-dev/apko:latest@sha256:c20fefe91b5e73c98e7347603d9ade099fa35438d395af518217a6550d9443d2
       run: |
         # Now change to our custom apko provider, note it may have a
         # digest drift w.r.t. imagetest sandbox digests, but the above