Update nginx Docker tag to v1.29.6 (#1055)

| datasource | package | from   | to     |
| ---------- | ------- | ------ | ------ |
| docker     | nginx   | 1.29.5 | 1.29.6 |

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

@@ -215,7 +215,7 @@ RUN xx-info env && git clone --depth 1 -b $DATADOG_VERSION https://github.com/Da
 
 
 ### Base build image for debian
-FROM nginx:1.29.5 AS build-nginx-debian
+FROM nginx:1.29.6 AS build-nginx-debian
 
 RUN DEBIAN_VERSION=$(awk -F '=' '/^VERSION_CODENAME=/ {print $2}' /etc/os-release) \
     && echo "deb-src [signed-by=/etc/apt/keyrings/nginx-archive-keyring.gpg] http://nginx.org/packages/mainline/debian/ ${DEBIAN_VERSION} nginx" >> /etc/apt/sources.list.d/nginx.list \
@@ -224,7 +224,7 @@ RUN DEBIAN_VERSION=$(awk -F '=' '/^VERSION_CODENAME=/ {print $2}' /etc/os-releas
 
 
 ### Base build image for alpine
-FROM nginx:1.29.5-alpine AS build-nginx-alpine
+FROM nginx:1.29.6-alpine AS build-nginx-alpine
 RUN apk add --no-cache \
     build-base \
     pcre2-dev \
@@ -251,12 +251,12 @@ RUN curl -fsSL -O https://github.com/nginx/nginx/archive/release-${NGINX_VERSION
 
 
 ### Base image for alpine
-FROM nginx:1.29.5-alpine AS nginx-alpine
+FROM nginx:1.29.6-alpine AS nginx-alpine
 RUN apk add --no-cache libstdc++
 
 
 ### Base image for debian
-FROM nginx:1.29.5 AS nginx-debian
+FROM nginx:1.29.6 AS nginx-debian
 
 
 ### Build final image