dev & test: bump deps

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Ah. refactor-nrepl lib test is failing because it depends on search.maven.org, which status shows as currently down:

Lotsa downtime on search.maven.org of late.

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Fired off an email to sonatype to offer my help (if that makes any sense) in restoring stability to search.maven.org.

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Looks like search.maven.org is back up again!

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Sonatype did get back to me. They don't seem to need my help at this time.

They wrote:

Unfortunately we have divested resources away from search.maven.org in favour of https://central.sonatype.com/ & are in the process of retiring that service from the web.
You can find more information on this here. Sorry for any inconvenience this may have caused.

I clarified usage in a reply:

I should have been clearer that my usage of search.maven.org is for the REST API as documented here: https://central.sonatype.org/search/rest-api-guide/

So, I think you are saying this current REST API will likely be shaky until a new one is created, but the new REST API is not available yet.
Is that right?

And they confirmed:

Yes, that is correct. We plan on making a more official statement once we have determined the next course of action for our users still using the old api. We apologize for any disruptions that may have been caused by this in the meantime.