[Chore] Fix baking package update in tezos update script

Problem: a recent change to the update_tezos.sh script breaks it,
due to an incorrect path being used in a 'sed' invocation.
See #658

Solution: Use the correct path to fix the script.

scripts/update-tezos.sh

@@ -46,7 +46,7 @@ if [[ "$latest_upstream_tag" != "$our_tezos_tag" ]]; then
 
     sed -i 's/"release": "[0-9]\+"/"release": "1"/' ./meta.json
     # Update version of tezos-baking package
-    sed -i "s/version = .*/version = \"$latest_upstream_tag\"/" ./code/pyproject.toml
+    sed -i "s/version = .*/version = \"$latest_upstream_tag\"/" ./baking/pyproject.toml
     # Commit may fail when release number wasn't updated since the last release
     git commit -a -m "[Chore] Reset release number for $latest_upstream_tag" --gpg-sign="[email protected]" || \
       echo "release number wasn't updated"