Touch up the new JWK sourcing

[Vladimir Dzhuvinov]

No description provided.

[Yavor Vasilev]

Issue #451 was marked as a duplicate of this issue.

[Vladimir Dzhuvinov]

version 9.28 (2023-01-05)
    * New JWKSourceBuilder entry point for building JWKSource instances that
      wrap a generic JWKSetSource with caching (including refresh ahead), rate
      limiting, retrial, fail-over, health status reporting and outage
      tolerance capabilities.
    * New CachingJWKSetSource, RefreshAheadCachingJWKSetSource,
      RateLimitedJWKSetSource, RetryingJWKSetSource, JWKSourceWithFailover,
      JWKSetSourceWithHealthStatusReporting and
      OutageTolerantJWKSetSource classes wrapping a generic JWKSetSource with a
      capability.
    * Deprecates the JWKSetCache interface and its DefaultJWKSetCache
      implementation.
    * Deprecates the RemoteJWKSet class.
    * Deprecates the JWKSetWithTimestamp class.
    * DefaultResourceRetriever adds support for file based URLs.
    * New JWKSet isEmpty and size shorthand methods.
    * New com.nimbusds.jose.util.cache package with generic CachedObject class.
    * New com.nimbusds.jose.util.events package with Event and EventListener
      interfaces.
    * New com.nimbusds.jose.util.health package with HealthReportListener
      interface, HealthReport class and HealthStatus enum.
    * New IOUtils.closeSilently(java.io.Closeable) method.