There is not a good solution to your situation. Basically you will either have to remove the tree or reset the bricks at a higher level or further away from the tree.
Tree roots grow under the surface and grow a larger with time lifting the soil or whatever else is on the ground surface. Putting a planting bed and around the tree is fine but I would add a lot of soils to the surface around the base. Space If you cut the large root of the tree that is lifting the brick that would prevent further damage that could make the tree less safe by weakening its anchorage on that side.
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