Support pytest_bdd 7.1.2 and later

[musicinmybrain]

Fix #1875.

This is the most straightforward way to work around #1875 if you want to preserve compatibility with pytest_bdd 7.1.1 and older. If you want to require pytest_bdd 7.1.2, you could drop the try/except.

In either case, the inject_fixture function is considered undocumented and unsupported, so it’s worth considering whether jrnl can avoid using it entirely.

Checklist

• I have read the contributing doc.
• I have included a link to the relevant issue number.
• I have checked to ensure there aren't other open pull requests
  for the same issue.
• I have written new tests for these changes, as needed. N/A

[musicinmybrain]

Lots of tests are failing, but I don’t think they are related to this PR, which works as a downstream patch for release 4.1.

[micahellison]

Thanks @musicinmybrain for the PR and analysis. Looks like there is another issue, but it's with pytest 8.1. I'm excluding that version for now to get this passing.