chore: bump lqt version to 2.0.0-alpha.2 (#5082)

## Describe your changes

Bumps the version in the LQT branch. Doing this to disambiguate between
active versions, in order to roll out
#5075 to the active
testnet.

## Issue ticket number and link

Refs #5010, #5075.

## Checklist before requesting a review

- [x] If this code contains consensus-breaking changes, I have added the
"consensus-breaking" label. Otherwise, I declare my belief that there
are not consensus-breaking changes, for the following reason:

  > version info only, no code changes