Bump the logback group with 2 updates (#289)

Bumps the logback group with 2 updates: [ch.qos.logback:logback-core](https://github.com/qos-ch/logback) and [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback).


Updates `ch.qos.logback:logback-core` from 1.5.12 to 1.5.15
- [Commits](qos-ch/logback@v_1.5.12...v_1.5.15)

Updates `ch.qos.logback:logback-classic` from 1.5.12 to 1.5.15
- [Commits](qos-ch/logback@v_1.5.12...v_1.5.15)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

divviup/build.gradle.kts

@@ -56,8 +56,8 @@ dependencies {
     testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")
     testImplementation("org.testcontainers:testcontainers:1.20.4")
     testImplementation("com.fasterxml.jackson.core:jackson-databind:2.18.2")
-    testImplementation("ch.qos.logback:logback-core:1.5.12")
-    testImplementation("ch.qos.logback:logback-classic:1.5.12")
+    testImplementation("ch.qos.logback:logback-core:1.5.15")
+    testImplementation("ch.qos.logback:logback-classic:1.5.15")
     testImplementation("commons-io:commons-io:2.18.0")
     testImplementation("org.mockito:mockito-core:5.14.2")
     androidTestImplementation(project(":divviup:commontest"))