Stop upgrading stwo in nightly (#2067)

Author: maciektr

.github/workflows/nightly.yml

@@ -45,8 +45,8 @@ jobs:
       - name: Upgrade Cairo-lint to latest main commit
         run: cargo xtask upgrade cairolint --rev $(git ls-remote --refs "https://github.com/software-mansion/cairo-lint" main | awk '{print $1}')
 
-      - name: Upgrade stwo-cairo to latest main commit
-        run: cargo xtask upgrade stwo-cairo --rev $(git ls-remote --refs "https://github.com/starkware-libs/stwo-cairo" main | awk '{print $1}')
+      # - name: Upgrade stwo-cairo to latest main commit
+      #   run: cargo xtask upgrade stwo-cairo --rev $(git ls-remote --refs "https://github.com/starkware-libs/stwo-cairo" main | awk '{print $1}')
 
       - name: Rebuild xtasks after Cargo.toml changes
         run: cargo build -p xtask