Bump the docker-deps group across 5 directories with 3 updates

Bumps the docker-deps group with 1 update in the /integration directory: golang.
Bumps the docker-deps group with 2 updates in the /internal/witness/cmd/feeder directory: golang and alpine.
Bumps the docker-deps group with 1 update in the /internal/witness/cmd/witness directory: golang.
Bumps the docker-deps group with 2 updates in the /trillian/examples/deployment/docker/ctfe directory: golang and distroless/base-debian12.
Bumps the docker-deps group with 1 update in the /trillian/examples/deployment/docker/envsubst directory: alpine.


Updates `golang` from 1.23.3-bookworm to 1.23.4-bookworm

Updates `golang` from 1.23.3-bookworm to 1.23.4-bookworm

Updates `alpine` from 3.20 to 3.21

Updates `golang` from 1.23.3-bookworm to 1.23.4-bookworm

Updates `golang` from 1.23.3-bookworm to 1.23.4-bookworm

Updates `distroless/base-debian12` from `7a4bffc` to `e9d0321`

Updates `alpine` from 3.20 to 3.21

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docker-deps
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docker-deps
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docker-deps
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docker-deps
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docker-deps
- dependency-name: distroless/base-debian12
  dependency-type: direct:production
  dependency-group: docker-deps
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docker-deps
...

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

integration/Dockerfile

@@ -1,6 +1,6 @@
 # This Dockerfile builds a base image for the certificate-transparency-go CloudBuild integration testing.
 # See https://hub.docker.com/_/golang for the set of golang base images.
-FROM golang:1.23.3-bookworm@sha256:3f3b9daa3de608f3e869cd2ff8baf21555cf0fca9fd34251b8f340f9b7c30ec5 as ct_testbase
+FROM golang:1.23.4-bookworm@sha256:ef30001eeadd12890c7737c26f3be5b3a8479ccdcdc553b999c84879875a27ce as ct_testbase
 
 WORKDIR /testbase
 

internal/witness/cmd/feeder/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23.3-bookworm@sha256:3f3b9daa3de608f3e869cd2ff8baf21555cf0fca9fd34251b8f340f9b7c30ec5 as builder
+FROM golang:1.23.4-bookworm@sha256:ef30001eeadd12890c7737c26f3be5b3a8479ccdcdc553b999c84879875a27ce as builder
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS
@@ -18,7 +18,7 @@ COPY . .
 RUN go build -o /build/bin/feeder ./internal/witness/cmd/feeder
 
 # Build release image
-FROM alpine:3.20@sha256:1e42bbe2508154c9126d48c2b8a75420c3544343bf86fd041fb7527e017a4b4a
+FROM alpine:3.21@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
 
 COPY --from=builder /build/bin/feeder /bin/feeder
 ENTRYPOINT ["/bin/feeder"]

internal/witness/cmd/witness/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23.3-bookworm@sha256:3f3b9daa3de608f3e869cd2ff8baf21555cf0fca9fd34251b8f340f9b7c30ec5 AS builder
+FROM golang:1.23.4-bookworm@sha256:ef30001eeadd12890c7737c26f3be5b3a8479ccdcdc553b999c84879875a27ce AS builder
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS
@@ -18,7 +18,7 @@ COPY . .
 RUN go build -o /build/bin/witness ./internal/witness/cmd/witness
 
 # Build release image
-FROM golang:1.23.3-bookworm@sha256:3f3b9daa3de608f3e869cd2ff8baf21555cf0fca9fd34251b8f340f9b7c30ec5
+FROM golang:1.23.4-bookworm@sha256:ef30001eeadd12890c7737c26f3be5b3a8479ccdcdc553b999c84879875a27ce
 
 COPY --from=builder /build/bin/witness /bin/witness
 ENTRYPOINT ["/bin/witness"]

trillian/examples/deployment/docker/ctfe/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23.3-bookworm@sha256:3f3b9daa3de608f3e869cd2ff8baf21555cf0fca9fd34251b8f340f9b7c30ec5 as build
+FROM golang:1.23.4-bookworm@sha256:ef30001eeadd12890c7737c26f3be5b3a8479ccdcdc553b999c84879875a27ce as build
 
 ARG GOFLAGS=""
 ENV GOFLAGS=$GOFLAGS
@@ -12,7 +12,7 @@ COPY . .
 
 RUN go build ./trillian/ctfe/ct_server
 
-FROM gcr.io/distroless/base-debian12@sha256:7a4bffcb07307d97aa731b50cb6ab22a68a8314426f4e4428335939b5b1943a5
+FROM gcr.io/distroless/base-debian12@sha256:e9d0321de8927f69ce20e39bfc061343cce395996dfc1f0db6540e5145bc63a5
 
 COPY --from=build /build/ct_server /
 

trillian/examples/deployment/docker/envsubst/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.20@sha256:1e42bbe2508154c9126d48c2b8a75420c3544343bf86fd041fb7527e017a4b4a
+FROM alpine:3.21@sha256:21dc6063fd678b478f57c0e13f47560d0ea4eeba26dfc947b2a4f81f686b9f45
 
 RUN apk add --no-cache gettext