Use Maven 3.9.12 for generated projects

Closes gh-1738

Author: mhalbritter

initializr-generator-spring/src/main/resources/maven/3/wrapper/.mvn/wrapper/maven-wrapper.properties

@@ -1,3 +1,3 @@
 wrapperVersion=3.3.4
 distributionType=only-script
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.11/apache-maven-3.9.11-bin.zip
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.12/apache-maven-3.9.12-bin.zip

initializr-parent/pom.xml

@@ -33,7 +33,7 @@
 		<java.version>17</java.version>
 		<commons-compress.version>1.27.1</commons-compress.version>
 		<commons-text.version>1.14.0</commons-text.version>
-		<maven.version>3.9.11</maven.version>
+		<maven.version>3.9.12</maven.version>
 		<maven-resolver.version>1.9.24</maven-resolver.version>
 		<spring-boot.version>3.5.8</spring-boot.version>
 		<spring-cloud-contract.version>4.3.0</spring-cloud-contract.version>