sys-kernel/zen-sources: Removed proxied maintainer

Removed proxied maintainer due to inactivity.
Closes: https://bugs.gentoo.org/633296
Package-Manager: Portage-2.3.13, Repoman-2.3.4

sys-kernel/zen-sources/metadata.xml

@@ -1,15 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-<maintainer type="person">
-	<email>[email protected]</email>
-	<name>Daniel Weiss</name>
-	<description>Maintainer. Assign bugs to him</description>
-</maintainer>
-<maintainer type="project">
-	<email>[email protected]</email>
-	<name>Proxy Maintainers</name>
-</maintainer>
+<!-- maintainer-needed -->
 <upstream>
 	<remote-id type="cpe">cpe:/o:linux:linux_kernel</remote-id>
 </upstream>