docs: release APISIX 3.9.1 (#11193)

Author: AlinsRan

docs/en/latest/building-apisix.md

@@ -48,7 +48,7 @@ To build and package APISIX for a specific platform, see [apisix-build-tools](ht
 First of all, we need to specify the version `APISIX_VERSION` to be installed:
 
 ```shell
-APISIX_VERSION='3.9.0'
+APISIX_VERSION='3.9.1'
 ```
 
 Then, you can run the following command to clone the APISIX source code from Github:

docs/en/latest/config.json

@@ -1,5 +1,5 @@
 {
-  "version": "3.9.0",
+  "version": "3.9.1",
   "sidebar": [
     {
       "type": "category",

docs/zh/latest/building-apisix.md

@@ -47,7 +47,7 @@ import TabItem from '@theme/TabItem';
 首先，我们需要指定需要安装的版本`APISIX_VERSION`:
 
 ```shell
-APISIX_VERSION='3.9.0'
+APISIX_VERSION='3.9.1'
 ```
 
 然后，你可以运行以下命令，从 Github 克隆 APISIX 源码：

docs/zh/latest/config.json

@@ -1,5 +1,5 @@
 {
-  "version": "3.9.0",
+  "version": "3.9.1",
   "sidebar": [
     {
       "type": "category",