Removes Keyman Developer Server's transitive dependency on dicer by
updating multer to `1.4.5-lts.1`, which updates its dependency on
busboy.
See
https://github.com/expressjs/multer/pull/1097#issuecomment-1141286771
for reasoning behind use of `-lts.1` rather than a full release
version.
At some point in the future, multer will publish a full release with
this fix, at which point we can move back to a full release version.
When rebuilding a model, Keyman Developer would query for the
registered model, but a missing simplifyId call meant that it never
matched the model name (due to `.` vs `_`).
