Update egui_tiles with fix for drag-and-drop-panic (#2555)

Easy fix:
rerun-io/egui_tiles@f958d8a

Closes #2552

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)

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PR Build Summary: https://build.rerun.io/pr/2555

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Docs preview: https://rerun.io/preview/7e89a6c/docs
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Cargo.toml

@@ -144,4 +144,4 @@ debug = true
 # As a last resport, patch with a commit to our own repository.
 # ALWAYS document what PR the commit hash is part of, or when it was merged into the upstream trunk.
 
-egui_tiles = { git = "https://github.com/rerun-io/egui_tiles.git", rev = "0127ad5eeed91beefd03b0ff1733200b32fb9a12" }
+egui_tiles = { git = "https://github.com/rerun-io/egui_tiles.git", rev = "f958d8af7ed27d925bc2ff7862fb1c1c45961b9e" }