chore: update MSRV to 1.66

Updating unicode-width from 1.13 to 1.14 broken the 1.65 MSRV. The
changes are compatible with 1.66, so just bump the MSRV for now.

.github/workflows/ci.yml

@@ -240,13 +240,13 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
 
   msrv:
-    name: Rust 1.65.0
+    name: Rust 1.66.0
     runs-on: ubuntu-22.04
     env:
       RUSTFLAGS: -Dwarnings
     steps:
       - uses: actions/checkout@v4.1.1
-      - uses: dtolnay/rust-toolchain@1.65.0
+      - uses: dtolnay/rust-toolchain@1.66.0
       # Only check boreal (and boreal-parser).
       # boreal-cli is a useful tool, but MSRV on it is not really useful.
       - run: |

benches/Cargo.toml

@@ -14,10 +14,6 @@ glob = "0.3.1"
 walkdir = "2.3"
 yara = { version = "0.19", features = ["vendored"] }
 
-# Only needed in tests because Mutex::new is not const
-# in 1.62 MSRV. Can be remove once MSRV is bumped above it.
-once_cell = "1.18"
-
 [[bench]]
 name = "boreal"
 harness = false

boreal-parser/Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["boreal", "yara", "parser"]
 categories = ["parser-implementations"]
 edition = "2021"
 # MSRV
-rust-version = "1.65"
+rust-version = "1.66"
 
 [dependencies]
 # Parsing library

boreal/Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["boreal", "yara", "string-matching", "scan"]
 categories = ["text-processing"]
 edition = "2021"
 # MSRV
-rust-version = "1.65"
+rust-version = "1.66"
 exclude = ["/tests"]
 
 [features]