fix: upgrade ch.qos.logback:logback-core from 1.5.12 to 1.5.15

Snyk has created this PR to upgrade ch.qos.logback:logback-core from 1.5.12 to 1.5.15.

See this package in maven:
ch.qos.logback:logback-core

See this project in Snyk:
https://app.snyk.io/org/pantheon.tech/project/3348edb4-60ec-477a-a2c0-2f81bcaa3572?utm_source=github&utm_medium=referral&page=upgrade-pr

pom.xml

@@ -30,7 +30,7 @@
 
         <application.main.class>io.lighty.yang.validator.Main</application.main.class>
         <application.attach.zip>true</application.attach.zip>
-        <logback-version>1.5.12</logback-version>
+        <logback-version>1.5.15</logback-version>
     </properties>
 
     <dependencies>