Update nginx Docker tag to v1.29.4 (#358)

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| docker     | nginx   | 1.29.3 | 1.29.4 |

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]

Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.20
-FROM nginx:1.29.3 AS nginx
+FROM nginx:1.29.4 AS nginx
 
 FROM redhat/ubi9:9.7-1764794285 AS rpm-build
 ARG NGINX