chore(deps): update sigstore/cosign-installer digest to 4a86152 (#866)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| sigstore/cosign-installer | action | digest | `37f3871` -> `4a86152` |

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.github/workflows/release-please.yaml

@@ -119,7 +119,7 @@ jobs:
             COMMIT=${{ github.sha }}
             DATE=${{ needs.release-please.outputs.date }}
       - name: Install Cosign
-        uses: sigstore/cosign-installer@37f387123cf7d4270454d0c351cf673ef28a8662
+        uses: sigstore/cosign-installer@4a861528be5e691840a69536975ada1d4c30349d
 
       - name: Sign the image
         run: |