Add new field dispatcher version to Worker model.

We want to store a dispatcher version model for each worker in db.
This will be done on HELLO message from the lava-slave daemon.
16 jobs for worker-version in 18 minutes and 38 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #92317
amd64
dispatcher-debian-10

00:02:49

passed #92319
amd64
dispatcher-debian-11

00:03:06

passed #92318
amd64
server-debian-10

00:03:30

passed #92320
amd64
server-debian-11

00:06:31

 
  Analyze
passed #92322
amd64
black

00:00:45

passed #92323
amd64
code_quality

00:00:27

passed #92324
amd64
coverage

00:07:04

59.04%
passed #92325
amd64
dockerfiles

00:00:22

passed #92327
amd64
pylint

00:03:03

passed #92321
amd64-dind
sast

00:02:19

passed #92326
amd64
schemas

00:00:37

 
  Build
passed #92329
amd64
debian/10

00:01:45

passed #92328
amd64
doc

00:00:45

passed #92330
amd64-dind
docker-amd64-dispatcher

00:02:08

passed #92385
amd64-dind
docker-amd64-server

00:02:49

failed #92331
amd64-dind
docker-amd64-server

01:00:01