sagemathgh-36522: Fix linter failure E401 multiple imports on one line

    
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New linter failure
```
./sage/misc/persist.pyx:1133:19: E401 multiple imports on one line
1       E401 multiple imports on one line
```

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URL: sagemath#36522
Reported by: Kwankyu Lee
Reviewer(s):

src/sage/misc/persist.pyx

@@ -1130,7 +1130,8 @@ def unpickle_all(target, debug=False, run_test_suite=False):
         Successfully unpickled 1 objects.
         Failed to unpickle 0 objects.
     """
-    import os.path, tarfile
+    import os.path
+    import tarfile
 
     ok_count = 0
     fail_count = 0