Update Drush

[RobLoach]

@GuyPaddock Tried updating the packages, and running into the following when running make build...

Step 4/6 : RUN docker-php-ext-install pdo_mysql pdo_pgsql
 ---> Running in 99bb66599d7c
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
(1/23) Installing m4 (1.4.18-r1)
(2/23) Installing perl (5.28.2-r1)
Killed
The command '/bin/sh -c docker-php-ext-install pdo_mysql pdo_pgsql' returned a non-zero code: 137

Do you get the same?