chore(ci): Ensure MSRV is quoted

Switching from specifying patch to not, with a minor version with a
trailing zero, is causing YAML to convert `1.70` to `1.7`.

Author: epage

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
-        toolchain: 1.65.0  # MSRV
+        toolchain: "1.65.0"  # MSRV
     - uses: Swatinem/rust-cache@v2
     - name: Default features
       run: cargo check --workspace --all-targets
@@ -119,7 +119,7 @@ jobs:
     - name: Install Rust
       uses: dtolnay/rust-toolchain@stable
       with:
-        toolchain: 1.65.0  # MSRV
+        toolchain: "1.65.0"  # MSRV
         components: clippy
     - uses: Swatinem/rust-cache@v2
     - name: Install SARIF tools