Bump distroless/base-debian12

Bumps the docker-deps group in /examples/deployment/docker/log_signer with 1 update: distroless/base-debian12.


Updates `distroless/base-debian12` from `c925d12` to `88e0a2a`

---
updated-dependencies:
- dependency-name: distroless/base-debian12
  dependency-type: direct:production
  dependency-group: docker-deps
...

Signed-off-by: dependabot[bot] <support@github.com>

examples/deployment/docker/log_signer/Dockerfile

@@ -18,7 +18,7 @@ RUN go install ./cmd/trillian_log_signer
 RUN go run github.com/google/go-licenses/v2 save ./cmd/trillian_log_signer --save_path /THIRD_PARTY_NOTICES
 
 # Make a minimal image.
-FROM gcr.io/distroless/base-debian12@sha256:c925d12234f8d3fbef2256012b168004d4c47a82c4f06afcfd06fd208732fbe0
+FROM gcr.io/distroless/base-debian12@sha256:88e0a2ac7c9b54f1ef941e7978c21fd45b46cc6e768f4bc28f3618a51438dc5d
 
 COPY --from=build /go/bin/trillian_log_signer /
 COPY --from=build /THIRD_PARTY_NOTICES /THIRD_PARTY_NOTICES