Bump luatest to 0.5.7-49-g9c7710e

Oleg Chaplashkin · ylobankov · commit 82542d3e2ffb · 2023-10-10T16:23:06.000+04:00
New version includes the following commits related to luatest functionality: - Save artifacts only once [1] [1] tarantool/luatest@9c7710e
diff --git a/lib/luatest b/lib/luatest
@@ -1 +1 @@
-Subproject commit 18859f6a67d7f92bda12297869d56928d9d7dc88
+Subproject commit 9c7710ed09006d11a90aea1f08e734b0f87355b3
