Submodule update fails due to make error in qt/qtimageformats

Please see https://codereview.qt-project.org/c/qt/qt5/+/322065 and the status update from CI Bot on 26.11.2020:

Continuous Integration: Failed

Running make failed. The CI rejected the staged commits due to the beforementioned reason. Possible reason could be a bug in one of the commits or some more recent change. Please investigate it.

The error was in "qt/qtimageformats", revision: cb82c74310837fe4e832c8ab72176a5d63e4355f

273: Mingw32-make[2]: *** [Makefile:47: sub-imageformats-make_first] Error 2 Mingw32-make[2]: Leaving directory 'C:/Users/qt/work/qt/qtimageformats/src/plugins' Mingw32-make[1]: *** [Makefile:73: sub-plugins-make_first] Error 2 Mingw32-make[1]: Leaving directory 'C:/Users/qt/work/qt/qtimageformats/src' Mingw32-make: *** [Makefile:48: sub-src-make_first] Error 2 Process finished with error: exit status 2 Executing scheduled instruction 1 of 1 - Upload all core dumps if there are some Skip uploading core files because CORE_FILES_PATH is not set in the environment agent:2020/11/26 00:22:25 build.go:662: Build failed ERROR building: exit status 2

Build log: https://testresults.qt.io/logs/qt/qtimageformats/7be1b0920b8e3d885db9e312da20d059cf101f6a/WindowsWindows_10x86_64AndroidAndroid_ANYmultiMingwqtci-windows-10-x86_64-51-642a63DisableTests/4964446e72aba2a1d73388cd9f4b626d567b0817/build_1606348000/log.txt.gz

Details: https://testresults.qt.io/coin/integration/qt/qt5/tasks/1606347202

Tested changes (refs/builds/qtci/5.15/1606347200): https://codereview.qt-project.org/c/qt/qt5/+/322065/10 Update submodules on '5.15' in qt/qt5