Bug fix release. See release notes: https://github.com/OSGeo/gdal/blob/v3.6.1/NEWS.md
Warning: GDAL 3.6.1 officially retracts GDAL 3.6.0 which could cause corruption of the spatial index of GeoPackage files it created (in tables with 100 000 features or more): cf qgis/QGIS#51188 and #6911. GDAL 3.6.1 fixes that issue. Setting OGR_GPKG_ALLOW_THREADED_RTREE=NO environment variable (at generation time) also works around the issue with GDAL 3.6.0. Users who have generated corrupted GeoPackage files with 3.6.0 can regnerate them with 3.6.1 with, for example, "ogr2ogr out_ok.gpkg in_corrupted.gpkg" (assuming a GeoPackage file with vector content only)