Remove honor_cipher_order option

[tombruijn]

A new hackney version has been released which no longer sets
honor_cipher_order to true by default. This means we can remove our
workaround. Make sure to upgrade hackney for AppSignal to work.

Workaround introduced in #516
Related issue #512

[tombruijn]

Waiting for a new hackney release to merge and publish this in a new patch release.

[tombruijn]

Hackney released a new version with the fix: https://hex.pm/packages/hackney

This PR can now be reviewed.

[jeffkreeftmeijer]

Discussed with Tom; we're closing this to allow users to keep using an older version of Hackney, even on OTP 22.1, by keeping our workaround in. The workaround only applies to our HTTP calls, and doesn't affect any other use of Hackney, and reverts the honor_cipher_order configuration to Erlang's (and now Hackney 1.5.2's) default:

honor_cipher_order() = boolean()
If set to true, use the server preference for cipher selection. If set to false (the default), use the client preference.

To allow us to remove this workaround, we might require a stricter Hackney dependency in the future.