fix: upgrade org.apache.maven:maven-artifact from 3.9.11 to 3.9.12

Snyk has created this PR to upgrade org.apache.maven:maven-artifact from 3.9.11 to 3.9.12.

See this package in maven:
org.apache.maven:maven-artifact

See this project in Snyk:
https://app.snyk.io/org/svanteschubert/project/e1dd93cf-d648-467d-ab98-0e151f4fa6b9?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

generator/schema2template-maven-plugin/pom.xml

@@ -34,7 +34,7 @@
     <version>0.13.0-SNAPSHOT</version>
     <packaging>maven-plugin</packaging>
     <properties>
-        <maven.version>3.9.11</maven.version>
+        <maven.version>3.9.12</maven.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
     <dependencies>