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GitHub switched to accepting TLS v1.2 only #408

@fuzzylogiq

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@fuzzylogiq

https://githubengineering.com/crypto-removal-notice/

This is causing errors with GitHubReleasesInfoProvider e.g.

Error opening URL: https://api.github.com/repos/munki/munki/releases [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) Unexpected GitHub API status code None. Error opening URL: https://api.github.com/repos/chilcote/outset/releases [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) Error opening URL: https://api.github.com/repos/clburlison/pinpoint/releases [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) Unexpected GitHub API status code None.

EDIT: urllib2 in system Python does not support TLS v1.2 on any version of macOS earlier than 10.13 currently.

EDIT2: This also breaks autopkg search on <10.13

(previous post said no version of macOS Python supported TLS v1.2)

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