python3: fix CVE-2025-6075

If the value passed to os.path.expandvars() is user-controlled a
performance degradation is possible when expanding environment variables.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2025-6075

Upstream-patch:
https://github.com/python/cpython/commit/9ab89c026aa9611c4b0b67c288b8303a480fe742

(From OE-Core rev: 5313fa5236cd3943f90804de2af81358971894bc)

Signed-off-by: Praveen Kumar <praveen.kumar@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-devtools/python/python3_3.12.12.bb

@@ -34,6 +34,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \
 	   file://0001-test_deadlock-skip-problematic-test.patch \
 	   file://0001-test_active_children-skip-problematic-test.patch \
            file://0001-test_readline-skip-limited-history-test.patch \
+           file://CVE-2025-6075.patch \
            "
 
 SRC_URI:append:class-native = " \