Fix tests sample_privatector sample_privatedtor failing with Python 3.11.5

Fix tests sample_privatector sample_privatedtor failing with Python 3.11.5

Remove special characters from the format string as they cause:
ValueError PyUnicode_FromFormatV() expects an ASCII-encoded format string, got a non-ASCII byte: 0xc2

Fixes: PYSIDE-2465
Pick-to: 6.6 6.5 6.2 5.15
Change-Id: I506efcb44168fdc979a1d16bf33d5d5d14525e2e
Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io>
(cherry picked from commit e726ec6450553d268413ab10ed68889a1c1f4fa6)

Gbp-Pq: Name Fix-tests-sample_privatector-sample_privatedtor-failing-w.patch