fix: use Alchemy mainnet endpoint for ENS resolution

Co-Authored-By: [email protected] <[email protected]>

python/src/wallets/crossmint/tests/conftest.py

@@ -67,3 +67,15 @@ def test_phone():
 def test_user_id():
     """Fixture providing test user ID for wallet creation."""
     return 12345
+
+
+@pytest.fixture
+def test_wallet_options():
+    """Get test wallet options."""
+    return {
+        "chain": "base-sepolia",
+        "provider": "https://sepolia.base.org",
+        "options": {
+            "ensProvider": f"https://eth-mainnet.g.alchemy.com/v2/{os.environ.get('ALCHEMY_API_KEY', '')}"
+        }
+    }