Deepfreeze essential parts of the encodings module. ### Description

This is a split off from #3582.

Deepfreeze essential parts of encodings module (encodings.\__init__, encodings.utf_8, and encodings.aliases), which is required during the Python bootstrap.

# .readthedocs.yml
# Read the Docs configuration file
# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details

# Required
version: 2

sphinx:
  configuration: docs/conf.py

formats: all

python:
  install:
    - requirements: docs/requirements-doc.txt

build:
  os: ubuntu-20.04
  tools:
    python: "3.11"
    nodejs: "14"

# .readthedocs.yml
# Read the Docs configuration file
# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details

# Required
version: 2

sphinx:
  configuration: docs/conf.py

formats: all

python:
  install:
    - requirements: docs/requirements-doc.txt

build:
  os: ubuntu-20.04
  tools:
    python: "3.11"
    nodejs: "14"
