Something must have gone awry when publishing version 4.5.1 as the oshi-parent module is missing from Maven Central.
Check https://repo.maven.apache.org/maven2/com/github/oshi/oshi-parent/4.5.1/ which only has the .asc PGP signature but not the oshi-parent-4.5.1.pom file or the other checksum files.
Perhaps you can manually (re)publish the parent module? as it it now this wil cause any maven build to fail after upgrading eg. oshi-core to 4.5.1 because the dependencies cannot be resolved properly.
Not sure if I can fix 4.5.1 but I will try a 4.5.2....
Made it as far as staging this time...

OK, 4.5.2 is released. May take a few hours to show up in the search. I'll leave this issue open for about 24 hours for anyone else stumbling on the problem.
:tada: just upgraded my project to 4.5.2 succesfully.
Thanks
Woot! And all the files are at https://repo.maven.apache.org/maven2/com/github/oshi/oshi-parent/4.5.2/
As for what happened, I think I know. I had had a few failed builds trying to debug a maven plugin, and prior to the release that "worked" had clicked on the OSS gui to "drop" the previous staging repository, a few seconds before kicking off the new build. I suspect the actual drop was delayed a few more seconds and it deleted the first few files uploaded, namely the missing parent pom.
I'll make a note to be a bit more patient the next time something like this happens.
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:tada: just upgraded my project to 4.5.2 succesfully.
Thanks