dev-lang/swift: drop myself as a maintainer

Outstanding bugs:

* https://bugs.gentoo.org/935328
* https://bugs.gentoo.org/947141
* https://bugs.gentoo.org/950963
* https://bugs.gentoo.org/951183
* https://bugs.gentoo.org/956325
* https://bugs.gentoo.org/957759
* https://bugs.gentoo.org/966176
* https://bugs.gentoo.org/967272
* https://bugs.gentoo.org/981300

Most of these are build failure bugs. Swift's build system is very
particular, and antagonistic to the types of modifications needed to
allow it to both compile correctly and behave as a good Gentoo citizen.
The fragility has worsened over time.

It still builds cleanly in a fresh ebuildtester Docker container, but
has trouble on "real" systems, even with identical setups. See 978755
for the latest.

Signed-off-by: Itai Ferber <itai@itaiferber.net>

dev-lang/swift/metadata.xml

@@ -1,10 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-  <maintainer type="person">
-    <email>itai@itaiferber.net</email>
-    <name>Itai Ferber</name>
-  </maintainer>
+  <!-- maintainer needed -->
   <upstream>
     <remote-id type="github">swiftlang/swift</remote-id>
   </upstream>