AbuseLimitHandler does not handle scenarios where the local time is not synchronized with GitHub server time

[bitwiseman]

From this comment on #1895 :

GitHubClient has a method to get Date (or Instant).
https://github.com/hub4j/github-api/blob/main/src/main/java/org/kohsuke/github/GitHubClient.java#L916

Unfortunately, diff from local machine time is not reliable. The local machine may not be synchronized with the server time. We have to use the diff from the response time.
https://github.com/hub4j/github-api/blob/main/src/main/java/org/kohsuke/github/GHRateLimit.java#L543-L571

However, this PR is a huge step forward and I'd rather have this less than perfect code added than wait for the next release.

This is the code that need updating:

github-api/src/main/java/org/kohsuke/github/AbuseLimitHandler.java

Lines 116 to 122 in 314917e

	try {
	return Math.max(1000, Long.parseLong(v) * 1000);
	} catch (NumberFormatException nfe) {
	// The retry-after header could be a number in seconds, or an http-date
	ZonedDateTime zdt = ZonedDateTime.parse(v, DateTimeFormatter.RFC_1123_DATE_TIME);
	return ChronoUnit.MILLIS.between(ZonedDateTime.now(), zdt);
	}

[bitwiseman]

@holly-cummins
Do you have to create a PR for this?

[holly-cummins]

@holly-cummins Do you have time to create a PR for this?

Sorry, yes! On my list but I keep getting sidetracked. Will bump it to the top.