fix: upgrade ch.qos.logback:logback-core from 1.5.17 to 1.5.18

Snyk has created this PR to upgrade ch.qos.logback:logback-core from 1.5.17 to 1.5.18.

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

See this project in Snyk:
https://app.snyk.io/org/itext-ci/project/a060c1f3-41ba-4c59-874d-04aa8a291cf2?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

pom.xml

@@ -80,7 +80,7 @@
     <icu4j.version>76.1</icu4j.version>
     <itext.version>9.1.0</itext.version>
     <jackson.version>2.18.3</jackson.version>
-    <logback.version>1.5.17</logback.version>
+    <logback.version>1.5.18</logback.version>
 
     <!-- Test dependencies -->
     <junit-jupiter-api.version>5.12.0</junit-jupiter-api.version>