utils: indent 'with' continuation line
diff --git a/src/buildstream/utils.py b/src/buildstream/utils.py
index 79cbbde..b47bb47 100644
--- a/src/buildstream/utils.py
+++ b/src/buildstream/utils.py
@@ -1015,7 +1015,7 @@
             temp.close()
 
     with _signals.terminator(close_tempfile), \
-        tempfile.NamedTemporaryFile(suffix=suffix, prefix=prefix, dir=dir) as temp:
+            tempfile.NamedTemporaryFile(suffix=suffix, prefix=prefix, dir=dir) as temp:
         yield temp