Bump MSRV to 1.80

It should be old enough for most distros, and allows upgrading to `zbus 5.x`

.github/workflows/ci.yml

@@ -96,7 +96,7 @@ jobs:
     strategy:
       fail-fast: false
 
-    name: 'msrv - 1.77.0'
+    name: 'msrv - 1.80.0'
     runs-on: ubuntu-24.04
 
     steps:
@@ -109,7 +109,7 @@ jobs:
           sudo apt-get update -y
           sudo apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libadwaita-1-dev libdisplay-info-dev
 
-      - uses: dtolnay/rust-toolchain@1.77.0
+      - uses: dtolnay/rust-toolchain@1.80.0
 
       - uses: Swatinem/rust-cache@v2
 

Cargo.toml

@@ -8,7 +8,7 @@ authors = ["Ivan Molodetskikh <yalterz@gmail.com>"]
 license = "GPL-3.0-or-later"
 edition = "2021"
 repository = "https://github.com/YaLTeR/niri"
-rust-version = "1.77"
+rust-version = "1.80"
 
 [workspace.dependencies]
 anyhow = "1.0.93"

src/protocols/gamma_control.rs

@@ -177,7 +177,6 @@ where
                     }
 
                     // Verify that there's no more data.
-                    #[allow(clippy::unused_io_amount)] // False positive on 1.77.0
                     {
                         match file.read(&mut [0]) {
                             Ok(0) => (),