feat(curstions): Add the source artifact for XMLUnit 1.3

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

curations/Maven/xmlunit/xmlunit.yml

@@ -9,3 +9,12 @@
     vcs:
       type: "Subversion"
       url: "https://svn.code.sf.net/p/xmlunit/code"
+- id: "Maven:xmlunit:xmlunit:1.3"
+  curations:
+    comment: |
+      The source distribution was found via the homepage.
+    source_artifact:
+      url: "https://master.dl.sourceforge.net/project/xmlunit/xmlunit%20for%20Java/XMLUnit%20for%20Java%201.3/xmlunit-1.3-src.zip"
+      hash:
+        value: "b0d05b7a67ca2343668f61c0ba0ca2eecda86746"
+        algorithm: "SHA1"