fix ruff issues

scripts/cache-ruleset.py

@@ -17,7 +17,6 @@ See the License for the specific language governing permissions and limitations
 """
 import os
 import sys
-import time
 import logging
 import argparse
 

scripts/capa_as_library.py

@@ -2,7 +2,7 @@
 
 import json
 import collections
-from typing import Any, Dict
+from typing import Any, Dict, Set
 
 import capa.main
 import capa.rules
@@ -13,7 +13,6 @@ import capa.render.utils as rutils
 import capa.render.default
 import capa.render.result_document as rd
 import capa.features.freeze.features as frzf
-from capa.engine import *
 from capa.features.common import OS_AUTO, FORMAT_AUTO
 
 

scripts/lint.py

@@ -43,7 +43,7 @@ import capa.engine
 import capa.helpers
 import capa.features.insn
 from capa.rules import Rule, RuleSet
-from capa.features.common import OS_AUTO, FORMAT_PE, FORMAT_DOTNET, String, Feature, Substring
+from capa.features.common import OS_AUTO, String, Feature, Substring
 from capa.render.result_document import RuleMetadata
 
 logger = logging.getLogger("lint")