Fix outdated versions, template variables and version inconsistencies

- Update K8s Dashboard v2.0.0 to v2.7.0
- Update etcd v3.4.0 to v3.5.17
- Update PostgreSQL 15 to 16 for consistency
- Update Node.js 12 to 20 (current LTS)
- Replace unresolved GitBook template variables (CODE1/2/3/9)

07_dockerfile/7.8_volume.md

@@ -126,7 +126,7 @@ VOLUME /data
 #### 数据库持久化
 
 ```docker
-FROM postgres:15
+FROM postgres:16
 VOLUME /var/lib/postgresql/data
 ```
 
@@ -181,7 +181,7 @@ $ docker inspect mycontainer --format '{{json .Mounts}}' | jq
 ```yaml
 services:
   db:
-    image: postgres:15
+    image: postgres:16
     volumes:
       # 命名卷（推荐）
 
@@ -224,7 +224,7 @@ $ docker run -v mysql_data:/var/lib/mysql mysql:8.0
 ```docker
 ## 数据库必须使用卷
 
-FROM postgres:15
+FROM postgres:16
 VOLUME /var/lib/postgresql/data
 ```