`get_projection_info()` returns null epsg with rasterio 1.4.2

Hi,

I just have submitted [an issue](https://github.com/rasterio/rasterio/issues/3248) on rasterio.
It looks like `get_projection_info()` returns a `None` epsg code, since it uses `is_epsg_code` crom rasterio's CRS class which seems to be faulty to me. `to_epsg()` returns the correct code though.

Start by locating get_projection_info() and reproduce the None EPSG result with rasterio 1.4.2. Read the linked rasterio issue to determine whether the behavior belongs in rio-stac or its dependency, then verify that projection information returns the expected EPSG code without breaking other raster datasets.

Written by the indexing model from the issue text.