merge(3p/git): Merge git upstream at v2.26.2

third_party/git/t/t3419-rebase-patch-id.sh

@@ -80,7 +80,8 @@ do_tests () {
 		git commit -q -m "change big file again" &&
 		git checkout -q other^{} &&
 		git rebase master &&
-		test_must_fail test -n "$(git rev-list master...HEAD~)"
+		git rev-list master...HEAD~ >revs &&
+		test_must_be_empty revs
 	'
 
 	test_expect_success $pr 'do not drop patch' '
@@ -90,7 +91,7 @@ do_tests () {
 		git commit -q -m squashed &&
 		git checkout -q other^{} &&
 		test_must_fail git rebase squashed &&
-		rm -rf .git/rebase-apply
+		git rebase --quit
 	'
 }