chore: fix versions in package.json (#281)

Dependencies on packages in monorepo should always be `^0.0.0`. They
will be changed into exact dependency versions, if necessary, at release
time.

Due to some previous attempts at implementing that workflow, some
literal `"0.0.0"`'s had snuck into our `package.json`s, and `projen`
leaves them at whatever they are.

Now that we are explicitly setting versions back to `^0.0.0` at `unbump`
time, that causes a diff with respect to the literal exact versions that
are in the repo.

Manually set them to caret versions.


---
By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache-2.0 license

Author: rix0rrr