Bumped jaxen from 1.1.6 to 1.2.0 version

This fixes issue #1316 and finally fixes issue #1315.

This change switches from Jaxen 1.1.6 to 1.2.0 to allow compilation of
the projects that rely on SpotBugs project with Java 11.

Jaxen is a transitive optional dependency of dom4j that we use in
SpotBugs.

Jaxen 1.1.6 ships org.w3c.dom package, which is also now shipped by JDK
in java.xml module. Java 9+ comiler disallow compilation if modules on
module path ship same package. So compilation of spotbugsTestCases with
Java 11 fails if the target release is 11 with the error: "The package
org.w3c.dom is accessible from more than one module: <unnamed>,
java.xml".

Solution is to update Jaxen to 1.2.0 version, that does not ship
org.w3c.dom package anymore.

Signed-off-by: Andrey Loskutov <loskutov@gmx.de>

CHANGELOG.md

@@ -6,6 +6,7 @@ Currently the versioning policy of this project follows [Semantic Versioning v2.
 
 ## Unreleased - 2020-??-??
 ### Changed
+* Bump jaxen from 1.1.6 to 1.2.0 supporting Java 11 compilation ([#1316](https://github.com/spotbugs/spotbugs/issues/1316))
 * Bump ASM from 8.0.1 to 9.0 supporting JDK16 (sealed classes)
 
 ## 4.1.3 - 2020-09-25

spotbugs/build.gradle

@@ -80,7 +80,7 @@ dependencies {
     exclude group: 'pull-parser',      module: 'pull-parser'
     exclude group: 'xpp3',             module: 'xpp3'
   }
-  implementation 'jaxen:jaxen:1.1.6' // only transitive through dom4j:dom4j:1.6.1, which has an *optional* dependency on jaxen:jaxen.
+  implementation 'jaxen:jaxen:1.2.0' // only transitive through dom4j:dom4j:1.6.1, which has an *optional* dependency on jaxen:jaxen.
   api 'org.apache.commons:commons-lang3:3.11'
   api 'org.apache.commons:commons-text:1.9'
   api 'org.slf4j:slf4j-api:1.8.0-beta4'
@@ -104,7 +104,7 @@ dependencies {
   guiTestImplementation sourceSets.gui.runtimeClasspath
   guiTestImplementation 'junit:junit:4.13'
   guiTestCompileOnly project(':spotbugs-annotations')
-  
+
   // for Eclipse compilation only
   appleExtensions 'com.apple:AppleJavaExtensions:1.4'
 }
@@ -361,4 +361,4 @@ spotbugsTest {
 // TODO : validatesamplexmloutput
 
 // XML validation
-// TODO : validate
+// TODO : validate