chore: update Maven wrapper to version 3.3.4 in Spring Boot projects (#37)

Author: darbyluv2code

section-12-spring-boot-3-quick-start/01-spring-boot-demo/.mvn/wrapper/maven-wrapper.properties

@@ -1,2 +1,3 @@
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.6/apache-maven-3.8.6-bin.zip
-wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.12/apache-maven-3.9.12-bin.zip