Upcoming devtools release may impact srcpkgs

[jennybc]

Hi, I will release devtools soon and I notice this may cause an issue for riskmetric.

You can see the result here:

https://github.com/r-lib/devtools/blob/6a65ffbdf16623c36c0bbeda46867974a8526c49/revdep/problems.md?plain=1#L52-L74

I cloned riskmetric and ran tests / checks locally and could not quickly determine what the issue is. I try to open a PR when I can, but I'm afraid that's not happening in this case. But I just want to give you a heads up.

The changes coming in devtools are bulleted here in the NEWS:

https://github.com/r-lib/devtools/blob/main/NEWS.md