DeprecationWarning: warning_filter

mkdocs==1.5.2
mdocs-monorepo-plugin==1.0.5

`mkdocs build`
`DeprecationWarning: warning_filter doesn't do anything since MkDocs 1.2 and will be removed soon.`

Expectation is to not see the warning when running mkdocs with the monorepo plugin - likely by removing the warning_filter logic.

Start by running `mkdocs build` with mkdocs==1.5.2 and mdocs-monorepo-plugin==1.0.5 to reproduce the DeprecationWarning. Search the plugin for `warning_filter` logic, remove the obsolete behavior if confirmed, and rerun the build to verify the warning no longer appears.

Written by the indexing model from the issue text.