depends: boost: update to 1.84.0

[tobtoht]

• Context for this PR: https://libera.monerologs.net/monero-dev/20240210#c331216
• Relevant for Add support for upcoming Boost 1.87.0 (Boost.Asio removals) #9596
• Needs depends: release type should be lower case #9457 to pass CI

[vtnerd]

@selsta Should we update the minimum Boost required? The Boost release notes list new libraries with each release. We currently list 1.58 as minimum. Bumping the minimum required allows us to use some newer libraries.

The most interesting libraries are: Boost.Hana (1.61), Boost.Fiber ("green" threads)(1.62), Stacktrace (1.65), Beast (http parsing)(1.66), Boost.Mp11 (1.66), Boost.Outcome (1.70), Boost.Json (1.75), and Boost.Url (1.81).

The Boost versions:

• Ubuntu 20.04 : 1.71 (EOL April 2025)
• Debian 10: 1.67 (EOL June 30 2024)
• Fedora 39: 1.81 (EOL Dec 7 2024)
• Void: 1.83?
• Arch: 1.83
• Gentoo: 1.82

I would recommend Boost 1.66 based on this list (does not include Centos, which is not listed in current documentation).

[selsta]

I think quite a few people still use Ubuntu 18.04 which seems to have boost 1.65, so I'd prefer nothing newer if possible.

[vtnerd]

Looks fine. I believe the failing tests are unrelated.

[vtnerd]

Should this be posted to the release branch too? This arguably violates the rule of not adding new features to the release branch, otoh the build has to be fixed to <boost 1.87.

[tobtoht]

Development builds on the release branch are currently broken on rolling release distros without a #9628 backport, so ideally, yes.

However, iirc we can't update to this version (1.84.0) without breaking Gitian. We might be able to update to 1.66.0 which should be sufficient.