devel/git: Update to 2.28.0 and build with svn lts

• Update to 2.28.0 [1]
• Change dependency to p5-subversion-lts if WITH_SUBVERSION_VER=LTS is set [2]

PR: 248308 [1]
Submitted by: Yasuhiro KIMURA <yasu@utahime.org> [1]

		des [2]

Sponsored by: Rubicon Communications, LLC (Netgate)