patch 8.2.5140: seachpair timeout test is flaky

Problem:    Seachpair timeout test is flaky.
Solution:   Mark the test as flaky so it is retried.
diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index 67d29c5..794dd1d 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -333,6 +333,7 @@
 
 func Test_searchpair_timeout()
   CheckFeature reltime
+  let g:test_is_flaky = 1
 
   func Waitabit()
     sleep 20m
@@ -1606,6 +1607,7 @@
 endfunc
 
 func Test_search_timeout()
+  let g:test_is_flaky = 1
   new
   " use a complicated pattern that should be slow with the BT engine
   let pattern = '\%#=1a*.*X\@<=b*'
diff --git a/src/version.c b/src/version.c
index 370c4d0..5b5b405 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5140,
+/**/
     5139,
 /**/
     5138,