refactor(mysql): update mysql connector coordinate during upgrade to …

…spring boot 2.7.x

In spring boot 2.7.8 onwards mysql connector coordinate `mysql:mysql-connector-java` has been removed and only `com.mysql:mysql-connector-j` coordinate exist.

https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.7-Release-Notes#mysql-jdbc-driver

So, updating the mysql connector coordinate as `com.mysql:mysql-connector-j` with spring boot upgrade to 2.7.18.

https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-dependencies/2.7.18/spring-boot-dependencies-2.7.18.pom

kayenta-sql/kayenta-sql.gradle

@@ -2,6 +2,6 @@ dependencies {
  implementation project(":kayenta-core")
  implementation "org.springframework.boot:spring-boot-starter-data-jpa"
  implementation "org.liquibase:liquibase-core"
- runtimeOnly "mysql:mysql-connector-java"
+ runtimeOnly "com.mysql:mysql-connector-j"
  runtimeOnly "org.postgresql:postgresql"
 }