brltty 6.0 available in buster-backports

[Samuel Thibault]

Hello,

For people interested in it, brltty 6.0 will be available in
buster-backports within a few hours. The procedure is the same as for
upgrading at-spi:

https://wiki.debian.org/accessibility#Upgrading_the_Assistive_Technology_At_Spi

Samuel