Fix rust-toolchain action: add explicit toolchain: stable input

All jobs failed with "invalid toolchain name ''" because the
dtolnay/rust-toolchain action requires an explicit toolchain parameter.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ParthJadhav

.github/workflows/ci.yml

@@ -30,6 +30,7 @@ jobs:
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@888c2e1ea69ab0d4330cbf0af1ecc7b68f368cc1 # stable
         with:
+          toolchain: stable
           components: clippy
 
       - name: Rust cache
@@ -57,6 +58,8 @@ jobs:
 
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@888c2e1ea69ab0d4330cbf0af1ecc7b68f368cc1 # stable
+        with:
+          toolchain: stable
 
       - name: Rust cache
         uses: swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6 # v2.7.8
@@ -97,6 +100,8 @@ jobs:
 
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@888c2e1ea69ab0d4330cbf0af1ecc7b68f368cc1 # stable
+        with:
+          toolchain: stable
 
       - name: Rust cache
         uses: swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6 # v2.7.8

.github/workflows/release.yml

@@ -32,6 +32,8 @@ jobs:
 
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@888c2e1ea69ab0d4330cbf0af1ecc7b68f368cc1 # stable
+        with:
+          toolchain: stable
 
       - name: Bump version in package.json
         run: npm version ${{ inputs.version }} --no-git-tag-version
@@ -95,6 +97,7 @@ jobs:
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@888c2e1ea69ab0d4330cbf0af1ecc7b68f368cc1 # stable
         with:
+          toolchain: stable
           targets: ${{ matrix.platform == 'macos-arm' && 'aarch64-apple-darwin' || matrix.platform == 'macos-intel' && 'x86_64-apple-darwin' || '' }}
 
       - name: Rust cache