EE7 php warning in mail module on php 7.3

[robinsowell]

Technically, EE7 supports php 7.2.5. And on php 7.3, you can get this error:

Warning
Use of undefined constant STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT - assumed STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT' (this will throw an Error in a future version of PHP)
ee/ExpressionEngine/Controller/Settings/Email.php, line 38

Looks like STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT isn't available until php 7.4 (I THINK)

[bryannielsen]

This should be resolved now in versions 6.4.16 and 7.3.15