test: bump test-run to new version

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

- Bump luatest to 0.5.7-38-ge6a2093 [1]

[1] tarantool/test-run@affa13f

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

test-run @ affa13f2

-Subproject commit 02c48288c34562803a99a0a2da925e4c7170355e
+Subproject commit affa13f2740f401e540659b58ddef49e8df02607