QPID-7737: Upgrade SLF4j to 1.7.25

Also upgraded logback test dependency to 1.2.2
diff --git a/pom.xml b/pom.xml
index d9f1d3f..0bba9c2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -83,10 +83,10 @@
     <!-- Directory used for per test log file output -->
     <test.output.dir>${basedir}${file.separator}target${file.separator}surefire-reports${file.separator}junit</test.output.dir>
 
-    <logback-version>1.1.3</logback-version>
+    <logback-version>1.2.2</logback-version>
     <guava-version>18.0</guava-version>
     <fasterxml-jackson-version>2.5.3</fasterxml-jackson-version>
-    <slf4j-version>1.7.12</slf4j-version>
+    <slf4j-version>1.7.25</slf4j-version>
 
     <!-- dependency version numbers -->
     <geronimo-jms-1-1-version>1.1.1</geronimo-jms-1-1-version>