testing/qt-creator: remove botan-dev from makedepends
Botan dependency has been removed upstream in https://code.qt.io/cgit/qt-creator/qt-creator.git/commit/?id=d7178b88c4b2572fb83b28f8178940766216deed
Part of #16548
Botan dependency has been removed upstream in https://code.qt.io/cgit/qt-creator/qt-creator.git/commit/?id=d7178b88c4b2572fb83b28f8178940766216deed
Part of #16548