Select highest API version with multiple SigningConfig services #459
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Right now, when selecting a service or set of services, the SigningConfig will select the first match given a validity period and API version. If the client supports two API versions concurrently (e.g. Rekor v1 and Rekor v2) and the distributed signing config has entries for multiple API versions (which it will for Rekor), then the client may select an older API version depending on the sorting of the services.
This change sorts the supported API versions to select the highest API version first.
Fixes #453
Summary
Release Note
Documentation