fix(release): add missing toolchain input to rust-toolchain steps (#277)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Randolf J.

.github/workflows/release.yml

@@ -22,6 +22,8 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9 # stable
+        with:
+          toolchain: stable
       - name: Cache cargo artifacts
         uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2
       - name: Build
@@ -74,6 +76,8 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Install Rust toolchain
         uses: dtolnay/rust-toolchain@efa25f7f19611383d5b0ccf2d1c8914531636bf9 # stable
+        with:
+          toolchain: stable
       - name: Cache cargo artifacts
         uses: Swatinem/rust-cache@779680da715d629ac1d338a641029a2f4372abb5 # v2.8.2
       - name: Authenticate with crates.io