Avoid Sonar S5443 false positive in shell_open test

The Windows-drive test literal C:\tmp\a.txt tripped Sonar's
publicly-writable-directory rule on the 'tmp' substring (a false
positive - a test string, no runtime temp dir). Use C:\Users\me\... ,
testing the same drive-is-not-a-scheme behaviour.

Author: JE-Chen

test/unit_test/headless/test_shell_open_batch.py

@@ -27,7 +27,7 @@ def test_plan_file_path_is_realpathed():
 
 
 def test_windows_drive_is_a_file_not_a_scheme():
-    assert plan_open(r"C:\tmp\a.txt")["kind"] == "file"
+    assert plan_open(r"C:\Users\me\report.txt")["kind"] == "file"
 
 
 def test_verb_is_carried():