deps: update dependency org.springframework.boot:spring-boot-starter-data-jdbc to v4 (#2301)

Author: renovate-bot

samples/spring-data-jdbc/googlesql/pom.xml

@@ -55,7 +55,7 @@
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-data-jdbc</artifactId>
-      <version>3.5.7</version>
+      <version>4.0.0</version>
     </dependency>
 
     <!-- Add the Spanner JDBC driver. -->

samples/spring-data-jdbc/postgresql/pom.xml

@@ -55,7 +55,7 @@
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-data-jdbc</artifactId>
-      <version>3.5.7</version>
+      <version>4.0.0</version>
     </dependency>
 
     <!-- Add both the Cloud Spanner and the PostgreSQL JDBC driver. -->