dns/pear-Net_DNS2: upgrade to 1.5.2

Version 1.5.0 produces errors when used with PHP-8:

PHP Fatal error: Uncaught ValueError: fread(): Argument #2 ($length) must be greater than 0 in /usr/local/share/pear/Net/DNS2/Cache/File.

It has been fixed in 1.5.2.

PR: 263924
Approved by: sunpoet (maintainer)