Update nginx Docker tag to v1.29.2

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| docker     | nginx   | 1.29.1 | 1.29.2 |


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

Author: renovate[bot]

build/Dockerfile.nginx

@@ -4,7 +4,7 @@ FROM scratch AS nginx-files
 # the following links can be replaced with local files if needed, i.e. ADD --chown=101:1001 <local_file> <container_file>
 ADD --link --chown=101:1001 https://cs.nginx.com/static/keys/nginx_signing.rsa.pub nginx_signing.rsa.pub
 
-FROM nginx:1.29.1-alpine-otel
+FROM nginx:1.29.2-alpine-otel
 # the following apk update and add are to address CVE-2025-59375, CVE-2025-8961/CVE-2025-9165, CVE-2025-9230, and CVE-2025-9231/CVE-2025-9232 respectively.
 # once a new base image is available with these package updates, they can be removed.
 RUN apk update && apk add --no-cache 'libexpat>=2.7.2-r0' 'tiff>=4.7.1-r0' 'libcrypto3>=3.5.4-r0' 'libssl3>=3.5.4-r0'