algo: Fix AutomataConcatenation when first automaton has a word of len 1
For master
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10 jobs
39 minutes 48 seconds, queued for 3 seconds
From 1. 4., DockerHub introduces new very strict rate limitations on docker image pulls.
Consider changing FROM tags in dockerfiles to use altenative providers or add login step at the beginning of CI/CD job as authenticated requests aren't affected.