Standard weekly patch release

[1.4.2] - 2021-08-10

• Fixed recursive call for apply_to_collection(include_none=False) (#8719)
• Fixed truncated backprop through time enablement when set as a property on the LightningModule and not the Trainer (#8804)
• Fixed comments and exception message for metrics_to_scalars (#8782)
• Fixed typo error in LightningLoggerBase.after_save_checkpoint docstring (#8737)

Contributors

@Aiden-Jeon @ananthsub @awaelchli @edward-io
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