Bump dependency versions.

Change-Id: I6cd1614812af7f24988a76d546a4ea5cdbfa2fd8
diff --git a/examples/spring-boot/pom.xml b/examples/spring-boot/pom.xml
index 4c3a36f..1d0b678 100644
--- a/examples/spring-boot/pom.xml
+++ b/examples/spring-boot/pom.xml
@@ -22,12 +22,16 @@
   <artifactId>quarkus-googlecloud-jsonlogging-spring-boot-example</artifactId>
   <name>Quarkus Google Cloud JSON Logging Extension - Spring Boot Example</name>
 
+  <properties>
+    <spring-boot.version>2.7.3</spring-boot.version>
+  </properties>
+
   <dependencyManagement>
     <dependencies>
       <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-dependencies</artifactId>
-        <version>2.6.2</version>
+        <version>${spring-boot.version}</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -92,7 +96,7 @@
       <plugin>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
-        <version>2.6.2</version>
+        <version>${spring-boot.version}</version>
       </plugin>
     </plugins>
   </build>