fix: respect excludes in zappa_settings

[colinhoernig]

Fixes excludes in settings so it's respected.

in zappa_settings.json

    "exclude": [
      "boto3",
      "botocore",
      "mypy",
      "pytest",
      "bandit",
      "black"
    ],

tackle-public-api on  ckh/ENG-3616/exclude-dev-deps [$!] via 🐍 tackle-public-api 
❯ zappa package dev
Important! A new version of Zappa is available!
Upgrade with: pip install zappa --upgrade
Visit the project page on GitHub to see the latest changes: https://github.com/Zappa/Zappa
Calling package for stage dev..
Warning! Your project and virtualenv have the same name! You may want to re-create your venv with a new name, or explicitly define a 'project_name', as this may cause errors.
Downloading and installing dependencies..
 - typed-ast==1.4.3: Using locally cached manylinux wheel
 - regex==2021.4.4: Using locally cached manylinux wheel
 - pyyaml==5.4.1: Downloading
100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 662k/662k [00:00<00:00, 33.4MB/s]
 - pytest==6.1.2: ignored, skipping...
 - pydantic==1.8.2: Using locally cached manylinux wheel
 - pip==21.0.1: ignored, skipping...
 - mypy==0.812: ignored, skipping...
 - markupsafe==2.0.1: Downloading
100%|██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 30.6k/30.6k [00:00<00:00, 8.07MB/s]
 - lazy-object-proxy==1.6.0: Using locally cached manylinux wheel
 - cryptography==3.4.7: Using locally cached manylinux wheel
 - coverage==5.5: Using locally cached manylinux wheel
 - cffi==1.14.5: Using locally cached manylinux wheel
 - botocore==1.20.79: ignored, skipping...
 - boto3==1.17.79: ignored, skipping...
 - black==20.8b1: ignored, skipping...
 - bandit==1.7.0: ignored, skipping...
Packaging project as zip.
Package created: tacklepublicapi-dev-1626815151.zip (42.7MiB)