request: smallrye-jwt retries fetching keys if initial request fails

[The-Funk]

Describe the bug
smallrye-jwt seems to fetch keys from the OAuth provider's key endpoint only on first request, however if this original fetch fails, the library never retries, and all subsequent auth requests fail until the application is restarted.

Expected behavior
If there's a network blip on the first request and the application is unable to fetch proper keys, the library should retry fetching the keys on each successive auth request, or on a scheduled retry with some backoff, or on 1 in X number of subsequent requests (in case there are many requests).

Actual behavior
See bug description.

How to Reproduce?
Start an application with smallrye-jwt and with your OAuth provider firewalled and inaccessible or unrouteable. Once the startup process has fully completed, try authenticating (the request will fail). Re-establish connectivity between the application and the OAuth provider. Attempt authentication again. Tthe request will still fail despite the OAuth provider being available once again.

[benrose258]

I've noticed this too

[tsbudd]

I have noticed bugs concerning this issue.