Upgrade mysql-connector-java version to fix possible transaction rollback failure issue (#4425)

* add tech-support-qq-4.png

* Update README.md

* Enhance the user experience in the scenario of submitting duplicate keys

* Modify the key-value conflict exception prompt, adjust the code style

* Upgrade mysql-connector-java version to fix possible transaction rollback failure issue

* doc(CHANGES.md): update CHANGES.md

Co-authored-by: Jason Song <nobodyiam@gmail.com>

CHANGES.md

@@ -10,5 +10,6 @@ Apollo 2.1.0
 * [add cat-client as optional dependency](https://github.com/apolloconfig/apollo/pull/4414)
 * [refactor Functions class with lambda](https://github.com/apolloconfig/apollo/pull/4419)
 * [fix:occur a 400 error request when openapi key's parameter contain "a[0]"](https://github.com/apolloconfig/apollo/pull/4424)
+* [Upgrade mysql-connector-java version to fix possible transaction rollback failure issue](https://github.com/apolloconfig/apollo/pull/4425)
 ------------------
 All issues and pull requests are [here](https://github.com/apolloconfig/apollo/milestone/11?closed=1)

pom.xml

@@ -71,7 +71,7 @@
 		<javassist.version>3.23.1-GA</javassist.version>
 		<nacos-discovery-api.version>1.4.0</nacos-discovery-api.version>
 		<common-lang3.version>3.12.0</common-lang3.version>
-		<mysql-connector-java.version>8.0.28</mysql-connector-java.version>
+		<mysql-connector-java.version>8.0.29</mysql-connector-java.version>
 		<cat.client.version>3.1.0</cat.client.version>
 		<!-- Plugins Version -->
 		<maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>