Bump ch.qos.logback:logback-classic from 1.5.14 to 1.5.15

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.14 to 1.5.15.
- [Commits](qos-ch/logback@v_1.5.14...v_1.5.15)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -97,7 +97,7 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.5.14</version>
+        <version>1.5.15</version>
       </dependency>
       <dependency>
         <groupId>com.io7m.jdeferthrow</groupId>