fix: Include filename when parsing imports for gazelle (#1133)

diff --git a/gazelle/python/parse.py b/gazelle/python/parse.py
index 5cf0b89..6c0ef69 100644
--- a/gazelle/python/parse.py
+++ b/gazelle/python/parse.py
@@ -27,7 +27,7 @@
 
 def parse_import_statements(content, filepath):
     modules = list()
-    tree = ast.parse(content)
+    tree = ast.parse(content, filename=filepath)
     for node in ast.walk(tree):
         if isinstance(node, ast.Import):
             for subnode in node.names: