libheif: revbump for x265-3.6

Author: zlice

srcpkgs/libheif/template

@@ -1,7 +1,7 @@
 # Template file for 'libheif'
 pkgname=libheif
 version=1.17.5
-revision=1
+revision=2
 build_style=cmake
 makedepends="libjpeg-turbo-devel libpng-devel libde265-devel x265-devel
  libaom-devel"