bump msrv to 1.68.0

Author: KodrAus

.github/workflows/main.yml

@@ -98,7 +98,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.61.0
+      - uses: dtolnay/rust-toolchain@1.68.0
         with:
           components: clippy
       - uses: taiki-e/install-action@cargo-hack

Cargo.toml

@@ -13,7 +13,7 @@ A lightweight logging facade for Rust
 categories = ["development-tools::debugging"]
 keywords = ["logging"]
 exclude = ["rfcs/**/*"]
-rust-version = "1.61.0"
+rust-version = "1.68.0"
 edition = "2021"
 
 [package.metadata.docs.rs]