Update FirebaseHttpClient.h

[TrickSumo]

SSL fingerprint update.

[googlebot]

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[TrickSumo]

I signed it!

[googlebot]

CLAs look good, thanks!

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[riskiadi]

@TrickSumo How did you know firebase new fingerprint ?

[TrickSumo]

@riskiadi

Use this site and check for Test.firebaseio.com :-
https://www.grc.com/fingerprints.htm