BUG: limit select_dtypes(object) back compat fix to default str dtype#62402

rhshadrach merged 3 commits intopandas-dev:mainpandas-dev/pandas:mainfrom

jorisvandenbossche:string-dtype-select-dtypes-fixupjorisvandenbossche/pandas:string-dtype-select-dtypes-fixupCopy head branch name to clipboard