fix: build successfully from cargo vendor tarball (#1932)

## Description

closes #1931 

Fixes the broken build when building from the vendored tarball produced
by `cargo vendor`. The problem was with a config in `watchable v1.1.1`
and was fixed in `watchable v1.1.2`
(https://github.com/khonsulabs/watchable/releases/tag/v1.1.2).

## Notes & open questions

## Change checklist


Co-authored-by: Floris Bruynooghe <[email protected]>