leaflet.markercluster dependency MUST be updated to at least 1.5.0

[eefano]

... Otherwise our vaadin project will fail to build:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: no-name@undefined
npm ERR! Found: [email protected]
npm ERR! node_modules/leaflet
npm ERR! leaflet@"1.6.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer leaflet@"~1.3.1" from [email protected]
npm ERR! node_modules/leaflet.markercluster
npm ERR! leaflet.markercluster@"1.4.1" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

[eefano]

At the moment there's a workaround. From the main folder of the vaadin project, execute:
npm i --legacy-peer-deps