chore: bump MSRV to 1.81.0

Author: clechasseur

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        toolchain: [ 1.75.0, stable ]
+        toolchain: [ 1.81.0, stable ]
         os: [ ubuntu-24.04, macos-14, windows-2022 ]
         ignore-lock: [ false ]
     runs-on: ${{ matrix.os }}

aoclp_solutions/Cargo.toml

@@ -2,7 +2,7 @@
 name = "aoclp_solutions"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.75.0"
+rust-version = "1.81.0"
 
 [dependencies]
 aoclp = { path = "../aoclp" }

aoclp_solutions/README.md

@@ -4,7 +4,7 @@ My solutions to [Advent of Code](https://adventofcode.com/) puzzles in Rust 🦀
 
 ## Requirements
 
-* [Rust](https://www.rust-lang.org/) 1.75.0 or later
+* [Rust](https://www.rust-lang.org/) 1.81.0 or later
 * [aocf](https://crates.io/crates/aocf) CLI
 
 ## Setting your session cookie

codingquest_clp_solutions/Cargo.toml

@@ -2,7 +2,7 @@
 name = "codingquest_clp_solutions"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.75.0"
+rust-version = "1.81.0"
 
 [dependencies]
 clap = { workspace = true, features = ["derive"] }

codingquest_clp_solutions/README.md

@@ -4,7 +4,7 @@ My solutions to [Coding Quest](https://codingquest.io/) puzzles in Rust 🦀
 
 ## Requirements
 
-* [Rust](https://www.rust-lang.org/) 1.75.0 or later
+* [Rust](https://www.rust-lang.org/) 1.81.0 or later
 
 ## Saving problem input data