⬆️ Update alpine_3_21/nginx to v1.26.3-r0 (#238)

Author: renovate[bot]

phpmyadmin/Dockerfile

@@ -10,7 +10,7 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN \
     apk add --no-cache \
         mariadb-client=11.4.5-r0 \
-        nginx=1.26.2-r4 \
+        nginx=1.26.3-r0 \
         php82-curl=8.2.27-r0 \
         php82-fpm=8.2.27-r0 \
         php82-gd=8.2.27-r0 \