flake8: Fix issues after update (#13997)

chia/consensus/difficulty_adjustment.py

@@ -91,11 +91,6 @@ def _get_second_to_last_transaction_block_in_previous_epoch(
         # a block in the previous epoch, which would be height < 0
         return _get_blocks_at_height(blocks, last_b, uint32(0))[0]
 
-    # If the prev slot is the first slot, the iterations start at 0
-    # We will compute the timestamps of the 2nd to last block in epoch, as well as the total iterations at infusion
-    prev_slot_start_iters: uint128
-    prev_slot_time_start: uint64
-
     # The target block must be in this range. Either the surpass block must be a transaction block, or something
     # in it's sub slot must be a transaction block. If that is the only transaction block in the sub-slot, the last
     # block in the previous sub-slot from that must also be a transaction block (therefore -1 is used).

chia/simulator/wallet_tools.py

@@ -176,8 +176,6 @@ class WalletTool:
 
     def sign_transaction(self, coin_spends: List[CoinSpend]) -> SpendBundle:
         signatures = []
-        solution: Program
-        puzzle: Program
         for coin_spend in coin_spends:  # noqa
             secret_key = self.get_private_key_for_puzzle_hash(coin_spend.coin.puzzle_hash)
             synthetic_secret_key = calculate_synthetic_secret_key(secret_key, DEFAULT_HIDDEN_PUZZLE_HASH)

tests/build-job-matrix.py

@@ -18,8 +18,6 @@ def skip(path: Path) -> bool:
 
 
 def subdirs(per: str) -> List[Path]:
-    dirs: List[Path]
-
     if per == "directory":
         glob_pattern = "**/"
     elif per == "file":