build(deps): bump chainguard-dev/digestabot from 1.2.3 to 1.3.1 (#639)

Bumps [chainguard-dev/digestabot](https://github.com/chainguard-dev/digestabot) from 1.2.3 to 1.3.1.
- [Release notes](https://github.com/chainguard-dev/digestabot/releases)
- [Commits](chainguard-dev/digestabot@a3b776c...afe360a)

---
updated-dependencies:
- dependency-name: chainguard-dev/digestabot
  dependency-version: 1.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/digestabot.yaml

@@ -47,7 +47,7 @@ jobs:
           token: ${{ steps.octo-sts.outputs.token }}
           persist-credentials: false
 
-      - uses: chainguard-dev/digestabot@a3b776c1ca57d3127c85578cde8fef6eed3c75d3 # v1.2.3
+      - uses: chainguard-dev/digestabot@afe360aa3b0c29d88844138e8fa0349384398967 # v1.3.1
         with:
           token: ${{ steps.octo-sts.outputs.token }}
           author: "octo-sts[bot] <157150467+octo-sts[bot]@users.noreply.github.com>"