CPython notify-new-bugs-announce workflow fails for long issue body #456

Reporting this here after psf/gh-migration#7 (comment)

I just got a mail from GitHub telling me that the workflow failed after I opened an issue:

python/cpython#93249
https://github.com/python/cpython/runs/6606492855?check_suite_focus=true

Due to:

[Error: Bad Request] {
  status: 400,
  details: 'Send options (parameters starting with o:, h:, or v:) are limited to 16 kB total'
}

I suppose it should truncate long issue bodies (there's a big C stacktrace hidden in a <details> in there).