Bump org.springframework.boot:spring-boot-starter-parent from 2.7.18 …

…to 3.3.1

Dependabot couldn't find the original pull request head commit, d273304.

yoti-sdk-spring-boot-example/pom.xml

@@ -11,7 +11,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>2.7.18</version>
+    <version>3.3.1</version>
     <relativePath /> <!-- lookup parent from repository -->
   </parent>