Bump ch.qos.logback:logback-classic from 1.2.13 to 1.5.16 (#349)

* Bump ch.qos.logback:logback-classic from 1.2.13 to 1.5.16

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.2.13 to 1.5.16.
- [Commits](qos-ch/logback@v_1.2.13...v_1.5.16)

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

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

* Use slf4j v2 for tests

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alex Stockinger <mail@alexstockinger.de>

Author: dependabot[bot]

build.gradle

@@ -39,10 +39,11 @@ dependencies {
     testImplementation "org.junit.jupiter:junit-jupiter-api:$junitVersion"
     testImplementation "org.junit.jupiter:junit-jupiter-params:$junitVersion"
     testImplementation 'com.sparkjava:spark-core:2.9.4'
+    testImplementation "org.slf4j:slf4j-api:2.0.16"
 
     testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junitVersion"
     testRuntimeOnly "org.junit.vintage:junit-vintage-engine:$junitVersion"
-    testRuntimeOnly "ch.qos.logback:logback-classic:1.2.13"
+    testRuntimeOnly "ch.qos.logback:logback-classic:1.5.16"
 }
 
 java {