Bump luatest to 1.0.0-3-gf37b353

New version includes the following commits.

- assertions: Improved error message for one assert function [1]
- TAP output: add missing tabulation to artifacts [2]
- utils: add `version_current_ge_than()` [3]
- server: fix unix socket path length check [4]
- server: accept `new_box_uri` as a table [5]

The list excludes changes that are not related to test-run's usage:
documentation, testing of luatest itself, packaging of luatest and so
on.

[1]: tarantool/luatest@2a26c32
[2]: tarantool/luatest@5e8c3e3
[3]: tarantool/luatest@7b6f167
[4]: tarantool/luatest@a8b0389
[5]: tarantool/luatest@f37b353