roll back Rust edition back to 2021 (the world isn't ready yet)

Author: snshn

.github/workflows/ci-netbsd.yml

@@ -28,9 +28,7 @@ jobs:
       with:
         usesh: true
         prepare: |
-          /usr/sbin/pkg_add curl cwrappers gmake mktools pkgconf
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          /usr/sbin/pkg_add cwrappers gmake mktools pkgconf rust
         run: |
-          export PATH="/root/.cargo/bin:$PATH"
           cargo build --all --locked --verbose --no-default-features --features cli
           cargo test --all --locked --verbose --no-default-features --features cli

Cargo.toml

@@ -9,7 +9,7 @@ authors = [
     "rhysd <lin90162@yahoo.co.jp>",
     "Andriy Rakhnin <a@rakhnin.com>",
 ]
-edition = "2024"
+edition = "2021"
 description = "CLI tool for saving web pages as a single HTML file"
 homepage = "https://github.com/Y2Z/monolith"
 repository = "https://github.com/Y2Z/monolith"