upgrade Spring Boot 3.1.6

Author: DanielLiu1123

.github/workflows/build.yml

@@ -3,6 +3,7 @@ on:
   push:
     branches:
       - main
+      - 3.1.x
 jobs:
   build:
     runs-on: ubuntu-latest

gradle.properties

@@ -1,8 +1,8 @@
 group=com.freemanan
 artifact=httpexchange-spring-boot-starter
-version=3.1.5-SNAPSHOT
+version=3.1.6-SNAPSHOT
 
-springBootVersion=3.1.5
+springBootVersion=3.1.6
 springCloudVersion=2022.0.4
 spotlessVersion=6.22.0
 spotbugsVersion=5.2.1