Pin Rust toolchain for releases to 1.93.1

No functional change.

Bench: 3278762

Author: codedeliveryservice

.github/workflows/release.yml

@@ -49,7 +49,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@1.93.1
 
       - name: Install dependencies
         run: |