test: bump test-run to version w/ updated luatest

Bump test-run to new version with the following improvements:

- Bump luatest to 0.5.7-6-gee1f5c1 [1]
- Fix detection of debug builds [2]

[1] https://github.com/tarantool/test-run/pull/354
[2] https://github.com/tarantool/test-run/pull/356

Part of tarantool/luatest#238
Part of tarantool/luatest#251

NO_DOC=testing stuff
NO_TEST=testing stuff
NO_CHANGELOG=testing stuff