cargo: bump MSRV to 1.90.0

Author: HuijingHei

.github/workflows/rust.yml

@@ -17,7 +17,7 @@ env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: 1
   # Pinned toolchain for linting
-  ACTIONS_LINTS_TOOLCHAIN: 1.84.1
+  ACTIONS_LINTS_TOOLCHAIN: 1.90.0
 
 defaults:
   run:

Cargo.toml

@@ -3,7 +3,7 @@ name = "coreos-installer"
 repository = "https://github.com/coreos/coreos-installer"
 license = "Apache-2.0"
 edition = "2021"
-rust-version = "1.84.1"
+rust-version = "1.90.0"
 exclude = ["/.cci.jenkinsfile", "/.github", "/.gitignore", "/Dockerfile"]
 authors = [ "Benjamin Gilbert <bgilbert@redhat.com>" ]
 description = "Installer for Fedora CoreOS and RHEL CoreOS"

docs/release-notes.md

@@ -18,6 +18,8 @@ Internal changes:
 
 Packaging changes:
 
+- Require Rust ≥ 1.90.0
+
 ## coreos-installer 0.25.0 (2025-09-29)
 
 Major changes: