Update gdal requirement in /rastervision_gdal_vsi

Updates the requirements on [gdal](https://github.com/OSGeo/gdal) to permit the latest version.
- [Release notes](https://github.com/OSGeo/gdal/releases)
- [Changelog](https://github.com/OSGeo/gdal/blob/v3.8.5/NEWS.md)
- [Commits](OSGeo/gdal@v3.4.1...v3.8.5)

---
updated-dependencies:
- dependency-name: gdal
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

rastervision_gdal_vsi/requirements.txt

@@ -1,2 +1,2 @@
 rastervision_pipeline==0.30.1-dev
-gdal>=3.4.1,<=3.6.3
+gdal>=3.4.1,<=3.8.5