devel/tig: Update to 2.6.1
https://raw.githubusercontent.com/jonas/tig/refs/tags/tig-2.6.1/NEWS.adoc
PR: 296238
Approved by: 0mp (maintainer)
Approved by: fluffy (mentor)
MFH: 2026Q2
(cherry picked from commit 3e226ce7be7dada9414e2ae3a7a13fe870f43053)