Upgrade Spring Boot to 3.1.1 (#4136)

#### What type of PR is this?

/kind cleanup
/area core
/milestone 2.7.x

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

Upgrade Spring Boot to 3.1.1. See https://github.com/spring-projects/spring-boot/releases/tag/v3.1.1 for more.

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

```release-note
升级 Spring Boot 至 3.1.1
```

application/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'org.springframework.boot' version '3.1.0'
+    id 'org.springframework.boot' version '3.1.1'
     id 'io.spring.dependency-management' version '1.1.0'
     id "com.gorylenko.gradle-git-properties" version "2.3.2"
     id "checkstyle"

gradle.properties

@@ -1,2 +1 @@
 version=2.7.0-SNAPSHOT
-r2dbc-mysql.version=1.0.2

platform/application/build.gradle

@@ -1,7 +1,7 @@
 import org.springframework.boot.gradle.plugin.SpringBootPlugin
 
 plugins {
-    id 'org.springframework.boot' version '3.1.0' apply false
+    id 'org.springframework.boot' version '3.1.1' apply false
     id 'java-platform'
     id 'halo.publish'
     id 'signing'