Update dependency org.springframework.boot:spring-boot-gradle-plugin to v3.4.5

Author: renovate[bot]

sample-handler/build.gradle

@@ -6,7 +6,7 @@ buildscript {
 
    }
    dependencies {
-      classpath("org.springframework.boot:spring-boot-gradle-plugin:3.4.3")
+      classpath("org.springframework.boot:spring-boot-gradle-plugin:3.4.5")
       classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.9.2'
       //classpath 'org.kordamp.gradle:stats-gradle-plugin:0.2.2'
    }