Increase MSRV from 1.74 to 1.81

This will allow some dependencies to be updated to the latest version.

Author: nicholasbishop

.github/workflows/ci.yaml

@@ -19,12 +19,10 @@ name: CI
 jobs:
   msrv:
     runs-on: ubuntu-latest
-    env:
-      CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
     steps:
       - uses: actions/checkout@v4
-      - run: rustup toolchain install 1.74 --profile minimal --no-self-update
-      - run: rustup default 1.74
+      - run: rustup toolchain install 1.81 --profile minimal --no-self-update
+      - run: rustup default 1.81
       - uses: Swatinem/rust-cache@v2
       - run: rustc --version
       - run: cargo check

Cargo.toml

@@ -14,7 +14,7 @@ resolver = "2"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/google/authenticode-rs"
-rust-version = "1.74"
+rust-version = "1.81"
 version = "0.4.3"
 
 [workspace.dependencies]