chore(tests): update slow deposit tests.

Author: spencer-tb

tests/prague/eip6110_deposits/test_deposits.py

@@ -314,9 +314,9 @@
                             signature=0x03,
                             index=i,
                         )
-                        for i in range(1000)
+                        for i in range(500)
                     ],
-                    tx_gas_limit=60_000_000,
+                    tx_gas_limit=16_777_216,
                 ),
             ],
             id="many_deposits_from_contract",
@@ -486,9 +486,9 @@
                             index=i,
                             valid=False,
                         )
-                        for i in range(1000)
+                        for i in range(500)
                     ],
-                    tx_gas_limit=23_738_700,
+                    tx_gas_limit=10_000_000,
                 ),
             ],
             id="many_deposits_from_contract_oog",