Update dev/release/verify-release-candidate.sh

Co-authored-by: Kevin Liu <kevinjqliu@users.noreply.github.com>

Author: alamb

dev/release/verify-release-candidate.sh

@@ -128,6 +128,7 @@ test_source_distribution() {
   python3 -m venv .venv
   source .venv/bin/activate
   python3 -m pip install -U pip
+  python3 -m pip install -U maturin
   maturin develop
 
   #TODO: we should really run tests here as well