Update snapshot tests after merge with v0.34.0

Regenerated from macOS CI run #23602213577.
56 snapshots updated to reflect both text shaping changes
and v0.34.0 visual updates (scroll fade, etc.).

crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.00.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.25.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.50.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.67.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_1.75.png

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crates/egui_demo_lib/tests/snapshots/rendering_test/dpi_2.00.png

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