Update MSRV from 1.71 to 1.76 (feb 2024)

To support
- `async fn` and return-position `impl Trait` in traits (1.75)
- ptr::from_ref in latest cubeb release (1.76)

.github/workflows/msrv.yaml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Install Rust toolchain
         # Aligned with `rust-version` in `Cargo.toml`
-        uses: dtolnay/rust-toolchain@1.71
+        uses: dtolnay/rust-toolchain@1.76
 
       - name: Check out repository
         uses: actions/checkout@v3

Cargo.toml

@@ -15,7 +15,7 @@ include = [
     "LICENSE",
     "README.md",
 ]
-rust-version = "1.71"
+rust-version = "1.76"
 
 [dependencies]
 almost = "0.2.0"