Chore: version management

[thekaveman]

Standardizing on managing the version string in the pyproject.toml across Benefits projects.

See also cal-itp/eligibility-server#325

How to review

1. Checkout this branch
2. Rebuild app and devcontainer without caching docker compose build --no-cache client then the same for dev
3. Run docker compose run --entrypoint bash client to attach to a client container
4. Confirm pip freeze shows output similar to (look for the line mentioning benefits):

$ docker compose run --entrypoint bash client
calitp@afef4102469a:~/app$ pip freeze
asgiref==3.7.2
Authlib==1.2.1
# Editable install with no version control (benefits==2023.9.1)
-e /home/calitp/app
certifi==2023.7.22
cffi==1.15.1
...

5. Launch devcontainer
6. Confirm all tests pass

[machikoyasuda]

Confirmed: # Editable install with no version control (benefits==2023.9.1)

[angela-tran]

👀

[angela-tran]

I also successfully saw

# Editable install with no version control (benefits==2023.9.1)

and saw all 276 tests pass in the devcontainer