Bump ch.qos.logback:logback-core from 1.3.14 to 1.3.15 in /pepper-lib

Bumps [ch.qos.logback:logback-core](https://github.com/qos-ch/logback) from 1.3.14 to 1.3.15.
- [Commits](qos-ch/logback@v_1.3.14...v_1.3.15)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pepper-lib/pom.xml

@@ -37,7 +37,7 @@
 		<dependency>
 			<groupId>ch.qos.logback</groupId>
 			<artifactId>logback-core</artifactId>
-			<version>1.3.14</version>
+			<version>1.3.15</version>
 		</dependency>
 		<dependency>
 			<groupId>commons-io</groupId>