Make sure proc file is closed when reading

Author: anuraaga

src/find_libpython/__init__.py

@@ -147,7 +147,8 @@ def wrapper(*args: P.args, **kwds: P.kwargs) -> Iterable[str]:
 def _get_proc_library() -> Iterable[str]:
     pid = os.getpid()
     path = f"/proc/{pid}/maps"
-    lines = open(path).readlines()
+    with open(path) as f:
+        lines = f.readlines()
 
     for line in lines:
         path = line.split(" ", 5)[5].strip()