invalid yaml in conda `environment.yml`

## Expected Behavior
Should be able to build a conda environment from the `environment.yml` file

## Actual Behavior
Conda complains about invalid yaml syntax

## Steps to Reproduce the Problem

1. `conda env update --name skywater-pdk-scripts --file environment.yml`

## Specifications

- Version: commit 3d7617a
- Platform: Ubuntu 20.04