Clamp EPSG:3857 y to lowest/highest possible value instead of validity extent #11719
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Although the validity extent of EPSG:3857 in y direction only ranges from ~-85 to ~85 degrees, lower/higher values can be handled. To avoid geometries getting corrupted topologically when transforming values from high/low latitudes, we can clamp to the lowest/highest safe value instead of the validity extent.
Improves (but does not fix) #11672.