to_latex encoding issue
- [x] closes #14275
- [x] tests added / passed
- [x] passes `git diff upstream/master | flake8 --diff`
- [ ] whatsnew entry

## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/14329?src=pr) is 85.26% (diff: 100%)

> Merging [#14329](https://codecov.io/gh/pydata/pandas/pull/14329?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will increase coverage by **<.01%**

``` diff
@@             master     #14329   diff @@
==========================================
  Files           140        140          
  Lines         50630      50632     +2   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          43169      43171     +2   
  Misses         7461       7461          
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last update [6dcc238...f480b93](https://codecov.io/gh/pydata/pandas/compare/6dcc23862b6b60ce2a67436b4a278fbe4c05490f...f480b93570597a261b9388e6cbf2a96456be2762?src=pr)
 @nbonnotte it's failing on py3.5 + windows
 @jorisvandenbossche codecs.open was not reading the test file correctly. I updated the test, now everything looks good to me.
 @nbonnotte Thanks!
