test: freeze luatest version (master branch is broken)

dd335893 · Denis Smirnov · 3fef3759 · dd335893
Verified Commit dd335893 authored 2 years ago by Denis Smirnov
--- a/sbroad-cartridge/test_app/test_app-scm-1.rockspec
+++ b/sbroad-cartridge/test_app/test_app-scm-1.rockspec
@@ -12,7 +12,7 @@ dependencies = {
    'metrics == 0.14.0-1',
    'crud == 0.14.0-1',
    'cartridge-cli-extensions == 1.1.1-1',
-    'luatest',
+    'luatest == 0.5.7',
    'luacov'
 }
 build = {