Added support for environments where the FloatOperation signal is trapped in the Decimal library

[guspix]

From Python's Decimal module Quick-start Tutorial:

If the FloatOperation signal is trapped, accidental mixing of decimals and floats in constructors or ordering comparisons raises an exception

This is used to prevent loss of precision by using floats before converting to Decimal. This was happening in a couple of places in this library, which prevented me from using it in such an environment. The fix is pretty simple, presumably without changing any functionality for anyone.

[Magnie]

I was just about to make my own pull request for this.

I added the following to the top of qrcode/tests/test_qrcode.py:

import decimal
decimal.getcontext().traps[decimal.FloatOperation] = True

This would prevent future commits from reintroducing the issue.

[bartTC]

Very good catch, thank you!

There is a ruff rule that takes care of it. https://docs.astral.sh/ruff/rules/decimal-from-float-literal/
#408 includes your chnages, and the rule will prevent future occurences.