Bump ch.qos.logback:logback-classic from 1.5.12 to 1.5.15

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) 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-classic
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ junitBom = { module = "org.junit:junit-bom", version.ref = "junitVersion" }
 junitJupiterApi = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junitVersion" }
 junitJupiterEngine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junitVersion" }
 junitJupiterParams = { module = "org.junit.jupiter:junit-jupiter-params", version.ref = "junitVersion" }
-logbackClassic = { module = "ch.qos.logback:logback-classic", version = "1.5.12" }
+logbackClassic = { module = "ch.qos.logback:logback-classic", version = "1.5.15" }
 mockOauth2Server = { module = "no.nav.security:mock-oauth2-server", version = "2.1.10" }
 mockwebserver = { module = "com.squareup.okhttp3:mockwebserver", version = "4.12.0" }
 okHttp3 = { module = "com.squareup.okhttp3:okhttp", version = "4.12.0" }