Fix mypy errors attributed to pytorch_lightning.trainer.connectors.data_connector.py

[jxtngx]

What does this PR do?

Fix mypy errors attributed to pytorch_lightning.trainer.connectors.data_connector.py for issue #13445

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[otaj]

@JustinGoheen, we're sorry to hear that. @rohitgr7, are you gonna push it over the finish line or should I? I noticed you started pushing some commits ⚡

[rohitgr7]

@otaj it's done. Any things else needs to be done here? The CI is blocking the merge for now

[otaj]

@rohitgr7, awesome, thank you! 🎉. I guess we just have to wait on codeowners and CI