Redo support for Python 3.14

[ericwb]

Describe the bug

PR #1189 was introduced in Bandit 1.8.1 which caused a regression found in bug #1216. So the PR was reverted in #1217 so version 1.8.2 could be released without the regression.

So in order to support Python 3.14, #1189 still needs to be reintroduced and also fixing the condition found.

Reproduction steps

1. See #1216 and #1189

Expected behavior

Python 3.14 should pass the build and work with a new testcase similar to the issue found in #1216.

Bandit version

1.8.0 (Default)

Python version

3.13 (Default)

Additional context

No response