Update install.sh to function again with Kali

[b1tst0rm]

Description

2 bug fixes were applied:

1. Require docker-py to be 6.1.x to avoid an error with urllib3 (see: urllib3 v2 incompatibility docker/docker-py#3113) that prevented Caldera from enabling the builder plugin
2. Tweak install.sh such that the install for Kali distros works.

Will resolve mitre/caldera#2793

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

I have tested the pip install and install.sh on Kali 2023.1 (kali-rolling).

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works