In an internal version of Visual Studio, `arrow`, `concurrencpp` and
`qtwebengine` install failed with following error:
```
arrow: \cpp\src\arrow/json/object_writer.h(39): error C2039: 'string': is not a member of 'std'
concurrencpp: \include\concurrencpp/threads/thread.h(23): error C2039: 'string': is not a member of 'std'
qtwebengine: \src\3rdparty\gn\src\gn\escape.h(77): error C2039: 'string': is not a member of 'std'
```
This issue caused by the STL PR:
https://github.com/microsoft/STL/pull/4633, and according to Stephan's
suggestion, the affected files need to include the `Standard <string>
header`.
I have submitted an issue on the qt upstream:
https://bugreports.qt.io/browse/QTBUG-126156
* Update concurrencpp to 0.1.6
* Update CI baseline
* Enable shared builds
https://github.com/David-Haim/concurrencpp/issues/75 has been fixed.
* Update CI baseline
---------
Co-authored-by: chausner <chausner@users.noreply.github.com>
