Bump ch.qos.logback:logback-classic from 1.5.20 to 1.5.21 (#1000)

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.5.20 to 1.5.21.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.5.20...v_1.5.21)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-version: 1.5.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

pom.xml

@@ -66,7 +66,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.5.20</version>
+            <version>1.5.21</version>
             <scope>test</scope>
         </dependency>
     </dependencies>