chore(deps): update sigstore/cosign-installer digest to 398d4b0

Author: renovate[bot]

.github/workflows/bake.yaml

@@ -73,7 +73,7 @@ jobs:
 
       # Even if we're testing we sign the images, so we can push them to production later if that's required
       - name: Install cosign
-        uses: sigstore/cosign-installer@fb28c2b6339dcd94da6e4cbcbc5e888961f6f8c3 # v3
+        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3
         # See https://github.blog/security/supply-chain-security/safeguard-container-signing-capability-actions/
         # and https://github.com/actions/starter-workflows/blob/main/ci/docker-publish.yml for more details on
         # how to use cosign.
@@ -174,7 +174,7 @@ jobs:
           done
 
       - name: Install cosign
-        uses: sigstore/cosign-installer@fb28c2b6339dcd94da6e4cbcbc5e888961f6f8c3 # v3
+        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3
 
       - name: Sign images
         run: |