chore(deps): update sigstore/cosign-installer digest to 6e04d22 (#721)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| sigstore/cosign-installer | action | digest | `d130283` -> `6e04d22` |

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.github/workflows/release-please.yaml

@@ -119,7 +119,7 @@ jobs:
  COMMIT=${{ github.sha }}
  DATE=${{ steps.date.outputs.date }}
  - name: Install Cosign
- uses: sigstore/cosign-installer@d13028333d784fcc802b67ec924bcebe75aa0a5f
+ uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06
 
  - name: Sign the image
  run: |