Prepare for developing 2.16.0 (#5856)

#### What type of PR is this?

/kind cleanup
/area core

#### What this PR does / why we need it:

This is a regular action after releasing a minor version.

#### Does this PR introduce a user-facing change?

```release-note
None
```

README.md

@@ -26,7 +26,7 @@
 ## 快速开始
 
 ```bash
-docker run -d --name halo -p 8090:8090 -v ~/.halo2:/root/.halo2 halohub/halo:2.14
+docker run -d --name halo -p 8090:8090 -v ~/.halo2:/root/.halo2 halohub/halo:2.15
 ```
 
 以上仅作为体验使用，详细部署文档请查阅：<https://docs.halo.run/getting-started/install/docker-compose>

gradle.properties

@@ -1 +1 @@
-version=2.15.0-SNAPSHOT
+version=2.16.0-SNAPSHOT

ui/packages/api-client/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@halo-dev/api-client",
-  "version": "2.15.0",
+  "version": "2.16.0",
   "description": "",
   "scripts": {
     "build": "unbuild",

ui/packages/components/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@halo-dev/components",
-  "version": "2.15.0",
+  "version": "2.16.0",
   "description": "",
   "files": [
     "dist"

ui/packages/editor/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@halo-dev/richtext-editor",
-  "version": "2.15.0",
+  "version": "2.16.0",
   "description": "Default editor for Halo",
   "homepage": "https://github.com/halo-dev/halo/tree/main/ui/packages/editor#readme",
   "bugs": {

ui/packages/shared/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@halo-dev/console-shared",
-  "version": "2.15.0",
+  "version": "2.16.0",
   "description": "",
   "files": [
     "dist"

ui/packages/ui-plugin-bundler-kit/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@halo-dev/ui-plugin-bundler-kit",
-  "version": "2.15.0",
+  "version": "2.16.0",
   "homepage": "https://github.com/halo-dev/halo/tree/main/ui/packages/ui-plugin-bundler-kit#readme",
   "bugs": {
     "url": "https://github.com/halo-dev/halo/issues"