$\mathrm{\mid }{V}_{cb}\mathrm{\mid }$ and $\gamma$ from $B$-mixing -- Addendum to "$B_s$ mixing observables and $\mathrm{\mid }{V}_{td}\mathrm{/}{V}_{ts}\mathrm{\mid }$ from sum rules"

In this addendum to “$B_s$ mixing observables and $\mathrm{\mid }{V}_{td}\mathrm{/}{V}_{ts}\mathrm{\mid }$ from sum rules” \cite{King:2019lal} we study the impact of the recent improvements in the theoretical precision of $B$ meson mixing onto CKM unitarity fits. Our key results are the most precise determination of the angle $\gamma = \left(63.4\pm0.9\right)^\circ$ in the unitarity triangle and a new value for the CKM element $\mathrm{\mid }{V}_{cb}\mathrm{\mid }=(41.6\pm 0.7)\cdot {10}^{-3}$.