fix roles/Cargo.lock

[plebhash]

apparently #871 still didn't fix roles/Cargo.lock

if we do (on an updated dev branch):

cd roles
cargo build

then roles/Cargo.lock changes state:

git status
On branch dev
Your branch is up to date with 'origin/dev'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   Cargo.lock

This issue has been going on for a while and is quite annoying because it keeps creating conflicts on history.

So now I just did:

git checkout -b fix-cargo-lock
git add Cargo.lock
git commit
git push plebhash fix-cargo-lock
# crate this PR

hopefully this PR fixes this issue once and for all.