Bump python version

[piiq]

Description

This PR upgrades the default python version to 3.9 in the dependencies and the documentation. This introduces the following features and fixes:

• Native support of Apple Silicon
• Resolves Open BB terminal fails to start on Mac M1 #1960
• Bumps version of tensorflow to 3.9 to resolve dependabot alerts
• Bumps the default python version for github actions

To test this PR recreate your conda environment following the updated documentation:

On M1 macs:

conda env remove -n gst
conda env create -n gst --file build/conda/conda-3-9-env.yaml
conda activate gst
poetry install
conda install -c apple tensorflow-deps
poetry install -E prediction-m1-mac

On all other platforms:

conda env remove -n gst
conda env create -n gst --file build/conda/conda-3-9-env.yaml
conda activate gst
poetry install
poetry install -E prediction

and run integrated tests for the terminal:

python terminal.py scripts/*.openbb -t

[piiq]

the integration tests produced the following errors:

GamestonkTerminal/scripts/test_econometrics_panel.openbb: 'NoneType' object has no attribute 'name'
GamestonkTerminal/scripts/test_econometrics_ts.openbb: 'NoneType' object has no attribute 'name'
GamestonkTerminal/scripts/test_crypto_dd.openbb: 429 Client Error: Too Many Requests for url: https://api.coingecko.com/api/v3/coins/list
GamestonkTerminal/scripts/test_crypto_ov.openbb: 'Highest'
GamestonkTerminal/scripts/test_economy.openbb: cannot do slice indexing on DatetimeIndex with these indexers  of type str
GamestonkTerminal/scripts/test_stocks_options.openbb: Expiration `2022-07-08` cannot be found. Available expiration are: [2022-07-15, 2022-09-16, 2023-01-20, 2023-03-17, 2023-06-16, 2023-09-15, 2024-01-19]

[piiq]

@JerBouma @Chavithra can you look if this works on windows? The test commands are in the PR description

[simmonsj330]

Looks good to me!

[simmonsj330]

Would changing the old version fallback tag to be done every version increase?

[piiq]

Would changing the old version fallback tag to be done every version increase?

Yes