Bump logback.version from 1.5.8 to 1.5.9

Bumps `logback.version` from 1.5.8 to 1.5.9.

Updates `ch.qos.logback:logback-classic` from 1.5.8 to 1.5.9
- [Commits](qos-ch/logback@v_1.5.8...v_1.5.9)

Updates `ch.qos.logback:logback-core` from 1.5.8 to 1.5.9
- [Commits](qos-ch/logback@v_1.5.8...v_1.5.9)

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

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

pom.xml

@@ -31,7 +31,7 @@
     <io7m.java.targetJavaVersion>21</io7m.java.targetJavaVersion>
 
     <!-- Third-party dependencies. -->
-    <logback.version>1.5.8</logback.version>
+    <logback.version>1.5.9</logback.version>
     <slf4j.version>2.0.16</slf4j.version>
     <org.junit.version>5.11.2</org.junit.version>
   </properties>