MAINTAINERS: update libvirt devel mailing list address

Effective immediately, the libvirt project has moved its list off
[email protected], to [email protected]

Signed-off-by: Daniel P. Berrangé <[email protected]>

Author: berrange

MAINTAINERS

@@ -4062,7 +4062,7 @@ F: gitdm.config
 F: contrib/gitdm/*
 
 Incompatible changes
-R: [email protected]
+R: [email protected]
 F: docs/about/deprecated.rst
 
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