QtTest: Update valgrind (fatuously) to v3.24.0

Nothing has changed in the headers we use, aside from the version
number, since v3.23.0, so we may as well declare ourselves up to
date.

[ChangeLog][Third-Party Code][QtTest] Valgrind headers are up to date
with Valgrind v3.24.0.

Task-number: QTBUG-132871
Change-Id: Ib2ad8d73e662535a014d241b46cc50214b45f50b
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
(cherry picked from commit 549bab4150b4652bb8b6577c737e49ae03f6348f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 9ed5d93c77f335cd58ae448bd7ce8ebb2c50fa74)

src/testlib/3rdparty/valgrind/qt_attribution.json

@@ -11,7 +11,7 @@
 
         "Description": "An instrumentation framework for building dynamic analysis tools.",
         "Homepage": "http://valgrind.org/",
-        "Version": "3.23.0",
+        "Version": "3.24.0",
         "PURL": "pkg:generic/valgrind@$<VERSION>?download_url=https://valgrind.org/",
         "License": "BSD 4-clause \"Original\" or \"Old\" License",
         "LicenseId": "BSD-4-Clause",

src/testlib/3rdparty/valgrind/valgrind_p.h

@@ -89,7 +89,7 @@
         || (__VALGRIND_MAJOR__ == 3 && __VALGRIND_MINOR__ >= 6))
 */
 #define __VALGRIND_MAJOR__    3
-#define __VALGRIND_MINOR__    23
+#define __VALGRIND_MINOR__    24
 
 
 #include <stdarg.h>