CLN: remove deprecated io.sql uquery and tquery functions
Were already deprecated since 0.14

## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13616?src=pr) is **84.55%**

> Merging [#13616](https://codecov.io/gh/pydata/pandas/pull/13616?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will increase coverage by **0.01%**

``` diff
@@             master     #13616   diff @@
==========================================
  Files           141        141          
  Lines         51209      51172    -37   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits          43294      43269    -25   
+ Misses         7915       7903    -12   
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last updated by [57b373c...197f663](https://codecov.io/gh/pydata/pandas/compare/57b373c97a8cd72f29a6206c5859661d8b926a97...197f663e835224e46ba2abb9d28df10a06a2d55c?src=pr)
