chore(deps): update ghcr.io/catthehacker/ubuntu:act-22.04 docker dige…

…st to af28d65 (#942)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/catthehacker/ubuntu | digest | `91f67c0` -> `af28d65` |

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charts/buildbarn/values.yaml

@@ -492,7 +492,7 @@ worker:
       # worker.runnerContainer.image.repository -- image repository (default is https://console.cloud.google.com/marketplace/product/google/rbe-ubuntu18-04)
       repository: ghcr.io/catthehacker/ubuntu
       # worker.runnerContainer.image.tag -- image tag
-      tag: act-22.04@sha256:91f67c0ca67fde4eceb59cb8c3c74cde09c074eadaf9ebc0050df11cd031ef21
+      tag: act-22.04@sha256:af28d6585afd1b7648bb7b977d1ca6c9b2b110e7062e917bc0ef45f6c2ae772b
     # worker.runnerContainer.securityContext -- specifies security settings for a container
     securityContext:
       runAsUser: 65534