Pin conda to 23.5.2 for Docker builds (#106473)
Fixes #106470
Since conda released version 23.7.2 - https://github.com/conda/conda/releases our nightly Docker build started to fail
```
#28 12.53 ResolvePackageNotFound:
#28 12.53 - conda==23.5.2
```
This PR pins conda Docker install to 23.5.2 to fix nightly Docker release
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106473
Approved by: https://github.com/seemethere, https://github.com/malfet
