Don't leak parent file descriptors to child processes

It is unexpected for the child process to inherit parent file descriptors.
Requires Qt >= 6.6 and only affects Linux.

Closes #10312.
PR #22457.

src/base/utils/foreignapps.cpp

@@ -57,6 +57,9 @@ namespace
         info = {};
 
         QProcess proc;
+#if defined(Q_OS_UNIX) && (QT_VERSION >= QT_VERSION_CHECK(6, 6, 0))
+        proc.setUnixProcessParameters(QProcess::UnixProcessFlag::CloseFileDescriptors);
+#endif
         proc.start(exeName, {u"--version"_s}, QIODevice::ReadOnly);
         if (proc.waitForFinished() && (proc.exitCode() == QProcess::NormalExit))
         {