Add retry on server errror 502

[koppor]

In case of large projects, maven central response with 502.

See JabRef/jabref-koppor#686 for a non-MWE.

Cannot determine dependency age for "com.vladsch.flexmark:flexmark-util-html:0.64.8" and repository "MavenRepo" (reason: IOException: Response for URL https://search.maven.org/solrsearch/select?q=g%3A%22com.vladsch.flexmark%22%20AND%20a%3A%22flexmark-util-html%22 returned 502).

I think, a "simply" retry after 3 seconds should be done in the case if 502 is returned.

[f4lco]

Hello @koppor, thank you for your feedback. This project is accepting contributions, and your suggestion seems worthwhile. Would you feel confident implementing a retry for a status code of 502?

[koppor]

@f4lco Yeah, I feel confident. I put it on my TODO list after the (unrelated) issue openrewrite/rewrite#4054 :)