Bump luatest to 0.5.7-18-gcb28d93

ylobankov · ylobankov · commit 94d8b10510b0 · 2022-12-06T15:52:14.000+04:00
New version includes the following commits related to luatest functionality: - Make server_instance.lua work for Tarantool < 2.8.1 [1] [1] tarantool/luatest@cb28d93
diff --git a/lib/luatest b/lib/luatest
@@ -1 +1 @@
-Subproject commit 1387aa8f50d48a0da01ca990e60dcf0adea9dc96
+Subproject commit cb28d9389249df29f4164540152185c927822607
