dev-python/ecdsa: Drop the proxy-maintainer to m-n

Luke-Jr does not want to be proxy maintainer
of this package, and is not sure how he became it(!).
See bug.

Bug: https://bugs.gentoo.org/699848
Signed-off-by: Sam James (sam_c) <sam@cmpct.info>
Closes: https://github.com/gentoo/gentoo/pull/15009
Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/ecdsa/metadata.xml

@@ -1,14 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-  <maintainer type="person">
-    <email>luke-jr+gentoobugs@utopios.org</email>
-    <name>Luke Dashjr</name>
-  </maintainer>
-  <maintainer type="project">
-    <email>proxy-maint@gentoo.org</email>
-    <name>Proxy Maintainers</name>
-  </maintainer>
+  <!-- maintainer-needed -->
   <upstream>
     <remote-id type="pypi">ecdsa</remote-id>
     <remote-id type="github">warner/python-ecdsa</remote-id>