Upgrade to Logback Classic 1.2.8 for test dependencies. (neo4j#1103)

Author: michael-simons

pom.xml

@@ -42,7 +42,7 @@
     <junit.version>5.8.2</junit.version>
     <jarchivelib.version>1.2.0</jarchivelib.version>
     <bouncycastle-jdk15on.version>1.70</bouncycastle-jdk15on.version>
-    <logback-classic.version>1.2.7</logback-classic.version>
+    <logback-classic.version>1.2.8</logback-classic.version>
     <jackson.version>2.13.0</jackson.version>
     <lombok.version>1.18.22</lombok.version>
     <svm.version>20.3.4</svm.version>