BUG: Fixed type annotations for read_sql_* functions.
Added dict of dict type to parse_dates union for `read_sql_query` and `read_sql_table` to match valid arguments.

- [x] closes #60085 
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

I did not check off the checklist item for adding an entry to `doc/source/whatsnew/vX.X.X.rst` because I was not sure which file there to edit. If you would like me to do so, please just let me know which one, and I would be happy to. These test failures seem to be completely unrelated to my changes (which just fixed some type annotations). Do you recommend rerunning them? > I did not check off the checklist item for adding an entry to `doc/source/whatsnew/vX.X.X.rst`

The type-hints in the pandas repo are internal, so this is not a user-facing change. As such, it does not need any entry in the whatsnew. Thanks @FakeNameSE 