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

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

- Properly ignore Unix sockets on artifact saving [1]
- Bump luatest to 0.5.7-34-g930b63b [2]

[1] tarantool/test-run@3afaccc
[2] tarantool/test-run@02c4828

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