Bump ch.qos.logback:logback-classic from 1.5.6 to 1.5.7

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.6 to 1.5.7.
- [Commits](qos-ch/logback@v_1.5.6...v_1.5.7)

---
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]>

vassal-app/pom.xml

@@ -37,7 +37,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.5.6</version>
+            <version>1.5.7</version>
         </dependency>
         <dependency>
             <groupId>com.miglayout</groupId>