Plaid2qif

- Changes to support python-plaid 8.x bhipple 🙏
- Dependabot security fixes
- Updates to CI to support automated deploy.

* Addresses auth issues relating to changes in the underlying Plaid SDK.
* Switch to use Poetry for dependency management.

* Provide support for using the `PLAID_ENV` environment variable for choosing the appropriate environment in Plaid for running. Valid values are: `development`, `sandbox`, & `production`. Default is `development`.
* Version of the Python Plaid SDK pinned at v2.4.1
* Improvements to documentation around setup & authentication.

* Adds new command line argument to ignore pending transactions. bhipple [2243525](https://github.com/ebridges/plaid2qif/commit/22435258a989e249bc0d05e2ca298948884af272)

* Add a new, required parameter to specify the location of credentials file. This is a backward-incompatible change to the CLI.
* Add support for installation via `pip`

* Order arguments correctly.