chore(deps): bump alpine from 3.17 to 3.21 in /build in the docker-images group across 1 directory (#7467)

* chore(deps): bump alpine

Bumps the docker-images group with 1 update in the /build directory: alpine.


Updates `alpine` from 3.17 to 3.21

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: docker-images
...

Signed-off-by: dependabot[bot] <[email protected]>

* revert to 3.19

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Paul Abel <[email protected]>

Author: dependabot[bot]

build/Dockerfile

@@ -106,7 +106,7 @@ USER 101
 
 
 ############################################# Base image for Alpine with NGINX Plus ##############################################
-FROM alpine:3.21@sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099 AS alpine-plus
+FROM alpine:3.21@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c AS alpine-plus
 ARG NGINX_PLUS_VERSION
 ARG PACKAGE_REPO
 
@@ -143,7 +143,7 @@ RUN --mount=type=bind,from=alpine-fips-3.21,target=/tmp/fips/ \
 
 
 ############################################# Base image for Alpine with NGINX Plus, App Protect WAF and FIPS #############################################
-FROM alpine:3.19@sha256:6380aa6b04faa579332d4c9d1f65bd7093012ba6e01d9bbcd5e2d8a4f9fae38f AS alpine-plus-nap-fips
+FROM alpine:3.19@sha256:e5d0aea7f7d2954678a9a6269ca2d06e06591881161961ea59e974dff3f12377 AS alpine-plus-nap-fips
 ARG NGINX_PLUS_VERSION
 ARG NGINX_AGENT
 ARG NGINX_PLUS_VERSION
@@ -183,7 +183,7 @@ RUN --mount=type=bind,from=alpine-fips-3.19,target=/tmp/fips/ \
 
 
 ############################################# Base image for Alpine with NGINX Plus, App Protect WAFv5 and FIPS #############################################
-FROM alpine:3.19@sha256:6380aa6b04faa579332d4c9d1f65bd7093012ba6e01d9bbcd5e2d8a4f9fae38f AS alpine-plus-nap-v5-fips
+FROM alpine:3.19@sha256:e5d0aea7f7d2954678a9a6269ca2d06e06591881161961ea59e974dff3f12377 AS alpine-plus-nap-v5-fips
 ARG NGINX_PLUS_VERSION
 ARG NGINX_AGENT
 ARG NGINX_PLUS_VERSION