SBT printed the locations it tried before failing with unresolved dependency. A quick way to check what version of Scala the library is compiled for is to cut the URL and browse it. For example SBT printed:
not found: https://repo1.maven.org/maven2/com/github/dmarcous/s2utils_2.13/1.1.0/s2utils_2.13-1.1.0.pom
If you cut the artifact name (s2utils_2.13) and later parts then you’re left with: https://repo1.maven.org/maven2/com/github/dmarcous If you browse that URL you’ll see that s2utils is published only for Scala 2.11 and Scala 2.12
That works for repositories like https://repo1.maven.org (since they contain all the publicly available artifacts) but doesn’t work for caches like local .ivy folder (since cache only contains already downloaded data).