use escalus 2.4.5

fix is_failed pred usag in sm_SUITE
Fix for merged records in escalus esl/escalus#24
Merge pull request #64 from pianiel/updates_for_escalus_2.4.5

Fix for merged records in escalus esl/escalus#24
Merge pull request #62 from esl/updates_for_escalus_2.4.5

Changes for escalus 2.4.5