Fix push time bug (#36693)

When display or search branch's pushed time, we should use
`updated_unix` rather than `commit_time`.

Fix #36633

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: silverwind <me@silverwind.io>

templates/repo/code/recently_pushed_new_branches.tmpl

@@ -6,7 +6,7 @@
 	{{range $recentBranch := $data.RecentlyPushedNewBranches}}
 	<div class="ui positive message flex-text-block">
 		<div class="tw-flex-1">
-			{{$timeSince := DateUtils.TimeSince $recentBranch.CommitTime}}
+			{{$timeSince := DateUtils.TimeSince $recentBranch.PushedTime}}
 			{{$branchLink := HTMLFormat `<a href="%s">%s</a>` $recentBranch.BranchLink .BranchDisplayName}}
 			{{ctx.Locale.Tr "repo.pulls.recently_pushed_new_branches" $branchLink $timeSince}}
 		</div>