Bump MSRV to 1.85

As mentioned in the CHANGELOG, this aligns with MSRV bumps across a few
dependencies as well as the most recent Debian stable release.
pkgsrc has 1.88 as of writing, so we're good to go there.

(I also copyedited the Trusted Publishing bit in the CHANGELOG.)

Author: featherbread

CHANGELOG.md

@@ -1,3 +1,14 @@
+## Unreleased
+
+### Changed
+
+- **Rust 1.85 or higher is required to build xt.** This change enables continued
+  updates of third-party dependencies as they adopt newer Rust features and
+  migrate to the 2024 Edition. (While xt has no specific MSRV policy at this
+  time, the version and timing of this bump align with the recent release of
+  Debian trixie, and are consistent with MSRV bumps in some of xt's direct
+  dependencies as well as Rust support in downstream package ecosystems.)
+
 ## v0.19.5 (2025-08-31)
 
 ### Changed
@@ -14,9 +25,8 @@
 Beginning with this release, GitHub Actions publishes xt to crates.io via
 [Trusted Publishing](https://crates.io/docs/trusted-publishing) to limit my
 personal use of long-lived API tokens. I make no long-term commitment to the
-continued use of Trusted Publishing, whose implementation as of writing requires
-that xt be hosted and built using proprietary services and infrastructure owned
-and operated by Microsoft Corporation.
+continued use of Trusted Publishing, whose implementation as of writing relies
+on proprietary services owned and operated by Microsoft Corporation.
 
 ## v0.19.4 (2025-02-23)
 

Cargo.lock

@@ -1,12 +1,12 @@
 [package]
 name = "xt"
-version = "0.19.6-dev"
+version = "0.20.0-dev"
 description = "Translate between serialized data formats"
 repository = "https://github.com/featherbread/xt"
 authors = ["Alex Hamlin <alex@alexhamlin.co>"]
 license = "MIT"
 edition = "2021"
-rust-version = "1.70.0"
+rust-version = "1.85.0"
 categories = ["command-line-utilities"]
 keywords = ["cli"]
 exclude = ["benches/**"]