[R-pkg-team] r-cran-modelmetrics is marked for autoremoval from testing

[Debian testing autoremoval watch]

r-cran-modelmetrics 1.2.2.2-1 is marked for autoremoval from testing on 2020-07-22

It (build-)depends on packages with these RC bugs:
962497: r-base, src:r-cran-data.table: r-base breaks r-cran-data.table autopkgtest: 'origin' must be supplied