Fix CI issues: remove unused imports in test files and update CI workflow to only check project-specific files

tests/test_parsers.py

@@ -1,5 +1,4 @@
 import pytest
-from pathlib import Path
 
 from shell_history_search.parsers import HistoryEntry
 from shell_history_search.parsers.bash import BashHistoryParser
@@ -140,4 +139,4 @@ class TestHistoryEntry:
 
         assert hash1 == hash2
         assert hash1 != hash3
-        assert len(hash1) == 16
+        assert len(hash1) == 16