Have more recent LIGO/VIRGO gravitational wave measurements narrowed down the speed of gravity further?
To get these kind of measurements one needs a gravitational wave detection with a electromagnetic counterpart. The big problem is, that the now quite common BH mergers are not expected to produce a detectable electromagnetic signature.
Therefore those can not be used to measure the speed of gravitational waves. At least not to any precision.
What you need is a binary neutron star merger. During the destruction and following accretion of the two NSs, these produce photons over the whole electromagnetic spectrum.    

Until now, there have only been detected two such mergers, GW170817 and S190425z.
As mentioned by @amateurAstro, GW170817 gave us the precise constraint added in the question. Judging from the citations in recent papers (e.g. this) the analysis by Abbott et al. 2017 is also still up to date.
For their constraint Abbott et al. assumed that the gamma-ray burst was emitted  between 0 and 10 seconds after the gravitational wave. If future simulations would be able to further constrain that range, this will also give us a more precise limit on the speed of gravitational waves. 

The other one is S190425z. The problem here is that the only 1/4 detectors were working so almost a quarter of the sky had to be searched. It was also quite far away. So unfortunately no counterpart was found.

So until we have a better theoretical understanding of NS merger or/and we observe another one, the constraint by Abbott et al. 2017 stands.