fix warning and deprecated crypto:hmac method with new OTP release #2
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from OTP 23 compilation
radius_codec.erl:7: Warning: export_all flag enabled - all functions will be exported
radius_codec.erl:33: Warning: crypto:hmac/3 is deprecated and will be removed in OTP 24; use use crypto:mac/4 instead
radius_codec.erl:121: Warning: crypto:hmac/3 is deprecated and will be removed in OTP 24; use use crypto:mac/4 instead