Update indexmap to version 2

[djc]

No description provided.

[djc]

Hmm, I guess you might not be eager to bump the MSRV to 1.64 yet.

[jplatte]

1.64 would be in line with hyper's MSRV policy of the MSRV always being at least 6 months old (1.64.0 was released on Sept. 22, 2022).

I would appreciate this being merged since it removes duplicate versions of indexmap & hashbrown from some dependency trees.

[djc]

@seanmonstar any opinions?

[khuey]

Likewise I'd also benefit from this. h2 is the last crate in my dependency tree using indexmap 1.x and hashbrown 0.12.x

[seanmonstar]

I recently bumped hyper to 1.63 (mostly because Tokio required it, not because hyper needs anything). While it would be within policy to go one more for 1.64, there's one thing that makes me hesitate: Debian stable is currently using 1.63. 🤔

[cuviper]

I don't think hashbrown really needs 1.64 -- only recent versions of its optional allocator-api2 dep need that, but its min-dep 0.2.9 does work with 1.63. And I can speak for indexmap that I only set 1.64 to keep up with hashbrown. These could possibly be relaxed!

[djc]

AIUI Debian stable will be on 1.63 for 2 years, but I don't think it will be tenable for this crate to stick to that for that kind of period. So what's the value in sticking to what Debian stable is today?

[cuviper]

At least for indexmap, it would be nice to let Debian users reach that v2 semver upgrade, even though 2.1 etc. may later raise the MSRV beyond 1.63. In this case, there wouldn't be any real sacrifice to offer that carrot.

[ds-cbo]

indexmap just released version v2.0.1 which supports MSRV 1.63.0. Could this PR get another CI-run?

[seanmonstar]

Seems like to time period to restart CI builds has expired, and I can't make them run again without a push.

[jplatte]

Close & reopen also triggers CI.

[ds-cbo]

Ah, too bad, we'll have to wait for rust-lang/hashbrown#457 to be released as hashbrown 0.14.1/0.15 before this will work. They seem to be on a quarterly release schedule with the next release guessed to be around October, so we'll need a bit more patience. Thanks for the retry anyway 😊

[cuviper]

Rust 1.63 should be sorted out with indexmap v2.0.2 and hashbrown v0.14.1.

[cuviper]

To be clear, those 1.63-compatible hashbrown and indexmap versions are already available.

[ds-cbo]

@seanmonstar Would you mind closing and re-opening the issue again to re-trigger CI? 😙 Should work this time

[djc]

Pushed a rebased version including some additional dev-dependency bumps.