Traceback when using passing file via stdin

[ericwb]

Describe the bug

Erics-MacBook-Pro-2:precli ericwb$ cat tests/unit/rules/python/stdlib/ssl/examples/get_server_certificate_no_timeout.py | bandit -
[main]	INFO	profile include tests: None
[main]	INFO	profile exclude tests: None
[main]	INFO	cli include tests: None
[main]	INFO	cli exclude tests: None
[main]	INFO	running on Python 3.12.4
[node_visitor]	WARNING	Unable to find qualified name for module: <stdin>
[tester]	ERROR	Bandit internal error running: trojansource on file <stdin> at line 0: [Errno 2] No such file or directory: '<stdin>'Traceback (most recent call last):
  File "/Users/ericwb/.pyenv/versions/3.12.4/lib/python3.12/site-packages/bandit/core/tester.py", line 53, in run_tests
    result = test(context)
             ^^^^^^^^^^^^^
  File "/Users/ericwb/.pyenv/versions/3.12.4/lib/python3.12/site-packages/bandit/plugins/trojansource.py", line 57, in trojansource
    with open(context.filename, "rb") as src_file:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '<stdin>'

Reproduction steps

1. Run, cat tests/unit/rules/python/stdlib/ssl/examples/get_server_certificate_no_timeout.py | bandit -
2. Note, the filename shouldn't matter
3. Notice the traceback.

Expected behavior

Should not get a traceback when using stdin. I'd also expect unit testcases to catch this when the trojansource plugin was added.

Bandit version

1.7.9 (Default)

Python version

3.12 (Default)

Additional context

bandit 1.7.10
  python version = 3.12.4 (main, Jun 25 2024, 11:01:48) [Clang 15.0.0 (clang-1500.3.9.4)]