REF: roll DatetimeBlock.astype into Block._astype (#38460)
REF: roll DatetimeBlock.astype into Block._astype (#38460)


datapythonista/pandas,rs2/pandas,jorisvandenbossche/pandas,rs2/pandas,gfyoung/pandas,pandas-dev/pandas,rs2/pandas,gfyoung/pandas,gfyoung/pandas,dsm054/pandas,gfyoung/pandas,jreback/pandas,jreback/pandas,pandas-dev/pandas,dsm054/pandas,datapythonista/pandas,rs2/pandas,pandas-dev/pandas,dsm054/pandas,pandas-dev/pandas,gfyoung/pandas,datapythonista/pandas,jorisvandenbossche/pandas,dsm054/pandas,datapythonista/pandas,jreback/pandas,dsm054/pandas,jreback/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,jreback/pandas