docs: specify python 3.11 & add uv as an option

[pbnj-dragon]

Background

I encountered an issue trying to install panther_analysis_tool using pip and uv (with python 3.12 and python 3.14) until I came across panther docs clearly stating python v3.11 as a prerequisite.

Changes

• Update README to clearly specify python 3.11 as a prerequisite
• Add uv as an install option

Testing

# make a temp directory
$ cd "$(mktemp -d)"

# initialize as a python project
$ uv init

# create virtual env
$ uv venv

# activate the env
$ source .venv/bin/activate

# install correct version of python
$ uv python install 3.11

# install panther_analysis_tool
$ uv add panther_analysis_tool