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a154422cec
### What does this PR try to resolve? Cargo registries that return HTTP 429 when the service is overloaded expect the client to retry the request automatically after a delay. Cargo currently does not retry for HTTP 429. ### What changed? * Adds HTTP 429 (too many requests) as a spurious HTTP error to enable retries. * Parse the [Retry-After](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After) HTTP header to determine how long to wait before a retry. In this implementation, the maximum delay is limited to Cargo's existing limit of 10 seconds. We could consider increasing that limit for this case, since the server is explicitly requesting the delay.