Update dependency nginx/agent to v3.0.3 (#3558)

* Update dependency nginx/agent to v3.0.3

| datasource  | package     | from   | to     |
| ----------- | ----------- | ------ | ------ |
| github-tags | nginx/agent | v3.0.2 | v3.0.3 |


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

* Update README

---------

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

Author: renovate[bot]

README.md

@@ -68,7 +68,7 @@ The following table lists the software versions NGINX Gateway Fabric supports.
 
 | NGINX Gateway Fabric | Gateway API | Kubernetes | NGINX OSS | NGINX Plus | NGINX Agent |
 |----------------------|-------------|------------|-----------|------------|-------------|
-| Edge                 | 1.3.0       | 1.25+      | 1.28.0    | R34        | v3.0.2      |
+| Edge                 | 1.3.0       | 1.25+      | 1.28.0    | R34        | v3.0.3      |
 | 2.0.1                | 1.3.0       | 1.25+      | 1.28.0    | R34        | v3.0.1      |
 | 2.0.0                | 1.3.0       | 1.25+      | 1.28.0    | R34        | v3.0.0      |
 | 1.6.2                | 1.2.1       | 1.25+      | 1.27.4    | R33        | ---         |

build/Dockerfile.nginx

@@ -7,7 +7,7 @@ ADD --link --chown=101:1001 https://cs.nginx.com/static/keys/nginx_signing.rsa.p
 FROM nginx:1.28.0-alpine-otel
 
 # renovate: datasource=github-tags depName=nginx/agent
-ARG NGINX_AGENT_VERSION=v3.0.2
+ARG NGINX_AGENT_VERSION=v3.0.3
 ARG NJS_DIR
 ARG NGINX_CONF_DIR
 ARG BUILD_AGENT

build/Dockerfile.nginxplus

@@ -8,7 +8,7 @@ FROM alpine:3.21
 
 ARG NGINX_PLUS_VERSION=R34
 # renovate: datasource=github-tags depName=nginx/agent
-ARG NGINX_AGENT_VERSION=v3.0.2
+ARG NGINX_AGENT_VERSION=v3.0.3
 ARG NJS_DIR
 ARG NGINX_CONF_DIR
 ARG BUILD_AGENT