security/sudo: update to 1.9.7

Among other changes this release fixes -fcommon errors. A complete list
of changes can be found at https://www.sudo.ws/stable.html/

PR:		255812
Submitted by:	Yasuhiro Kimura <yasu@utahime.org> (mostly)
Reported by:	Yasuhiro Kimura <yasu@utahime.org>
Tested by:	cy
Approved by:	garga (maintainer)
MFH:		2021Q2