dev-embedded/avra: Removed proxied maintainer

Removed proxied maintainer due to inactivity.
Closes: https://bugs.gentoo.org/633094
Package-Manager: Portage-2.3.13, Repoman-2.3.4

dev-embedded/avra/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>[email protected]</email>
-		<name>Petr Kocmid</name>
-	</maintainer>
-	<maintainer type="project">
-		<email>[email protected]</email>
-		<name>Proxy Maintainers</name>
-	</maintainer>
+<!-- maintainer-needed -->
 	<longdescription lang="en">
 		Assembler for Atmel AVR microprocessors
 	</longdescription>