[botan] Fix error C2039: 'string': is not a member of 'std'

[JonLiu1993]

In an internal version of Visual Studio, botan install failed with following error:

build\include\internal\botan/internal/pcurves_id.h(57): error C2039: 'string': is not a member of 'std'

This issue caused by the STL PR: microsoft/STL#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: randombit/botan#4278

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

[Billy O'Neal (BillyONeal)]

Thanks for the fix and for following up with upstream!