Extend androidtestrunner default timeout to 8 minutes

qmake had a feature to set androidtestrunner's timeout. This
feature is not yet ported to CMake. So with CMake, we always
have androidtestrunner's default timeout. Which was
five minutes. We have several tests which take just shy of five
minutes and are thus flaky.
This patch extends the timeout to eight minutes. This should be
a temporary workaround until the timeout feature is implemented
in CMake.

Task-number: QTBUG-101596
Pick-to: 6.2 6.3
Change-Id: Ia67ed6ab40a40f1b82861bd15bd04528ee9334ee
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/tools/androidtestrunner/main.cpp

@@ -64,7 +64,7 @@ struct Options
     bool helpRequested = false;
     bool verbose = false;
     bool skipAddInstallRoot = false;
-    std::chrono::seconds timeout{300}; // 5minutes
+    std::chrono::seconds timeout{480}; // 8 minutes
     QString buildPath;
     QString adbCommand{QStringLiteral("adb")};
     QString makeCommand;