v6.158.3

DiffEqBase v6.158.3

Diff since v6.158.2

Merged pull requests:

• Deprecate DiffEqBase.fastpow for FastPower.fastpower (#1089) (@ChrisRackauckas)
• Remove other hasmethod from callbacks (#1098) (@ChrisRackauckas)

Closed issues:

• Remove the hasmethod check (#1095)