Defining FORCE_COLOR=true makes mypy fail with traceback

[ssbarnea]

Bug Report

This looks like a recent regression as previous versions did not crash when FORCE_COLOR=true.

To Reproduce

export FORCE_COLOR=true
mypy ...

Expected Behavior

To work.

Actual Behavior

Traceback (most recent call last):
  File "/Users/ssbarnea/.cache/pre-commit/repo79gglgcf/py_env-python3/bin/mypy", line 8, in <module>
    sys.exit(console_entry())
             ^^^^^^^^^^^^^^^
  File "/Users/ssbarnea/.cache/pre-commit/repo79gglgcf/py_env-python3/lib/python3.11/site-packages/mypy/__main__.py", line 15, in console_entry
    main()
  File "mypy/main.py", line 70, in main
  File "mypy/util.py", line 538, in __init__
  File "mypy/util.py", line 523, in should_force_color
ValueError: invalid literal for int() with base 10: 'true'

Your Environment

• Mypy version used: 0.991
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.10