[PR #9579/0de39a6f backport][stable-10] use open() as context manager (#9596)

use open() as context manager (#9579)

* use open() as context manager

* add changelog frag

(cherry picked from commit 0de39a6f47)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

tests/unit/plugins/inventory/test_iocage.py

@@ -36,16 +36,14 @@ def inventory():
 
 
 def load_txt_data(path):
-    f = open(path, 'r')
-    s = f.read()
-    f.close()
+    with open(path, 'r') as f:
+        s = f.read()
     return s
 
 
 def load_yml_data(path):
-    f = open(path, 'r')
-    d = yaml.safe_load(f)
-    f.close()
+    with open(path, 'r') as f:
+        d = yaml.safe_load(f)
     return d