chore: upgrade rust: 1.85.1 -> 1.86.0 (again)

[basvandijk]

This reverts c458123 which reverted the upgrade to rust-1.86.0.

The upgrade to rust-1.86.0 in d1dc4c2 was initially reverted since it caused the
//rs/pocket_ic_server:... and //packages/pocket-ic:... tests to fail on x86_64-apple-darwin.

We have now debugged this failure and it turns out this is due to a bug in the apple linker that causes bad code to be generated for the hyper HTTP client crate used in both the pocket-ic library and server. (Full context here). LLVM has a workaround that they merged and rustc will integrate it soon.

Until then, it appears that the bug is only triggered when building with the default opt-level=2. Until we’ve upgraded to the newest rustc (for which we’ll need to wait for a new rules_rust version) we will build the hyper crate with opt-level=0(I tried opt-level=1 but that results in the same failure).

This rust upgrade should also fix the non-reproducibility of the archive_canister_u256 and related canisters.

[github-actions]

If this pull request changes the behavior of any canister owned by
the Governance team in an externally visible way, remember to
update the corresponding unreleased_changelog.md file(s).

To acknowldge this reminder (and unblock the PR), dismiss this
code review by going to the bottom of the pull request page, look
for where it says this bot is requesting changes, click the three
dots on the right, select "Dismiss review", and supply one of the
following reasons:

1. Done.

2. No canister behavior changes.

To be more precise, "externally visible behavior change" usually
means that responses differ in some way. However, "externally
visible behavior change" is not limited to that. For example, it
could also means that the canister makes different requests to
other canisters.

[github-actions]

If this pull request changes the behavior of any canister owned by
the Governance team in an externally visible way, remember to
update the corresponding unreleased_changelog.md file(s).

To acknowldge this reminder (and unblock the PR), dismiss this
code review by going to the bottom of the pull request page, look
for where it says this bot is requesting changes, click the three
dots on the right, select "Dismiss review", and supply one of the
following reasons:

1. Done.

2. No canister behavior changes.

To be more precise, "externally visible behavior change" usually
means that responses differ in some way. However, "externally
visible behavior change" is not limited to that. For example, it
could also means that the canister makes different requests to
other canisters.

No canister behavior changes.

[mbjorkqvist]

Thanks a lot for digging into this!

[kpop-dfinity]

Awesome!