Bump logback.version from 1.3.15 to 1.5.21

Bumps `logback.version` from 1.3.15 to 1.5.21.

Updates `ch.qos.logback:logback-classic` from 1.3.15 to 1.5.21
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.3.15...v_1.5.21)

Updates `ch.qos.logback:logback-core` from 1.3.15 to 1.5.21
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.3.15...v_1.5.21)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-version: 1.5.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: ch.qos.logback:logback-core
  dependency-version: 1.5.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -7,7 +7,7 @@
         <netty.version>4.2.7.Final</netty.version>
         <netty-reactive.version>2.0.6</netty-reactive.version>
         <fasterxml-jackson.version>2.15.0</fasterxml-jackson.version>
-        <logback.version>1.3.15</logback.version>
+        <logback.version>1.5.21</logback.version>
     </properties>
     <dependencies>
         <dependency>