use rust nightly

.github/workflows/release_crypto.yml

@@ -76,7 +76,10 @@ jobs:
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@master
+        with:
+          # This value should be updated to the `NIGHTLY` value in: https://github.com/matrix-org/matrix-rust-sdk/blob/main/xtask/src/main.rs
+          toolchain: nightly-2024-02-06
 
       #      - name: Create cargo config
       #        run: |