ci: install hermetic fixture network dependency

Author: BitHighlander

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Install contract-test dependencies
         run: |
-          pip install "protobuf>=3.20,<4" mnemonic ecdsa pytest
+          pip install "protobuf>=3.20,<4" mnemonic ecdsa pytest requests
 
       - name: Run deterministic Zcash PCZT contract tests
         env: