builders.description is not a function when running a conversion from v2.1.0 to v1

Building from source I see the following when I try to run the converter on Windows 11

```
node postman-collection-transformer\bin\postman-collection-transformer.js convert -i "Prisma Cloud.postman_collection.json" -j 2.1.0 -o PrismaCloudPostman10.json -p 1.0.0
Error: Unable to convert the input! builders.description is not a function

```