Update nginx:1.29.4-alpine3.23 Docker digest to fd9f8ce (release-5.3) (#8767)

Update nginx:1.29.4-alpine3.23 Docker digest to fd9f8ce

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build/Dockerfile

@@ -87,7 +87,7 @@ USER 101
 
 
 ############################################# Base image for Alpine #############################################
-FROM nginx:1.29.4-alpine3.23@sha256:052b75ab72f690f33debaa51c7e08d9b969a0447a133eb2b99cc905d9188cb2b AS alpine
+FROM nginx:1.29.4-alpine3.23@sha256:fd9f8ce722ab13edb2e47ebdd16b843939280457bf1567a6cd155203f9ce98d8 AS alpine
 ARG PACKAGE_REPO
 ARG NGINX_OSS_VERSION
 ARG NGINX_AGENT_VERSION