Add %conf to bracketing exceptions

RPM 4.18 added a %conf section:
https://rpm.org/docs/4.20.x/manual/spec.html#conf-since-rpm--418

Author: Mia Herkt

data/excludes-bracketing.txt

@@ -16,6 +16,7 @@ changelog
 check
 cmake
 cmake_[^\s]*
+conf
 config(\s*\([^)]*\))?
 configure
 create_exclude_filelist