fix: Key refresh should set no-cache to get most up to date keys#485
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Currently, the HTTP client fetches the keys without a
Cache-Controlheader. This can lead to potential issues because, with the current logic, we always attempt to revalidate when we encounter an unknownkid. Therefore, we want to ensure that we retrieve the most up-to-date keys from the OIDC server.For this reason, we should include a
Cache-Control: no-cacheheader in the request to ensure that the keys are revalidated and that we do not receive a stale key set from an intermediary proxy.Fixes #484