chore(deps): update sigstore/cosign-installer digest to 03d0fec (#657)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| sigstore/cosign-installer | action | digest | `46b5db7` -> `03d0fec` |

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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@46b5db744906311fb5af96dec633d262d16dfb5b
+        uses: sigstore/cosign-installer@03d0fecf172873164a163bbc64bed0f3bf114ed7
 
       - name: Sign the image
         run: |