GUACAMOLE-1594: Switch to Logback 1.3.x (supports Java 8).

doc/licenses/logback-1.3.4/README

@@ -1,8 +1,8 @@
 Logback (http://logback.qos.ch/)
 --------------------------------
 
-    Version: 1.4.4
+    Version: 1.3.4
     From: 'QOS.ch Sàrl' (http://qos.ch/)
     License(s):
-        EPL v1.0 (bundled/logback-1.4.4/LICENSE.txt)
+        EPL v1.0 (bundled/logback-1.3.4/LICENSE.txt)
 

doc/licenses/logback-1.3.4/dep-coordinates.txt

@@ -0,0 +1,2 @@
+ch.qos.logback:logback-classic:jar:1.3.4
+ch.qos.logback:logback-core:jar:1.3.4

doc/licenses/logback-1.4.4/dep-coordinates.txt

@@ -1,2 +0,0 @@
-ch.qos.logback:logback-classic:jar:1.4.4
-ch.qos.logback:logback-core:jar:1.4.4

pom.xml

@@ -44,7 +44,7 @@
         <jersey.version>2.37</jersey.version>
         <junit.version>5.9.1</junit.version>
         <junit4.version>4.13.2</junit4.version>
-        <logback.version>1.4.4</logback.version>
+        <logback.version>1.3.4</logback.version>
         <slf4j.version>2.0.3</slf4j.version>
 
         <!-- The directory that should receive all generated dependency lists