You'll ideally be running an environment that defaults to Python 2. To make things easy, use the recently released Raspberry Pi OS (Legacy) with desktop, which is derived from Debian Buster.
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Install dependencies:
sudo apt install build-essential clang libasound2-dev libgl1-mesa-dev libglu-dev libpulse-dev libssl-dev libssl1.0-dev libudev-dev libx11-dev libxcursor-dev libxi-dev libxinerama-dev libxrandr-dev pkg-config scons yasm
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Download the 2.1.4 source from Github, unpack and change into it:
wget https://github.com/godotengine/godot/archive/refs/tags/2.1.4-stable.tar.gz
tar xvf 2.1.4-stable.tar.gz