fix: correct rust-toolchain action name in release workflows

The GitHub Action is dtolnay/rust-toolchain, not dtolnay/rust-action.

.github/workflows/release-wallet.yml

@@ -50,7 +50,7 @@ jobs:
         run: npm install -g pnpm
 
       - name: Setup Rust
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}
 
@@ -149,7 +149,7 @@ jobs:
         run: npm install -g pnpm
 
       - name: Setup Rust
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Install system dependencies
         run: |

.github/workflows/release.yml

@@ -49,7 +49,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}
 
@@ -258,7 +258,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-action@stable
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Install system dependencies
         run: |