Fix typo in cargo.toml (#4279)

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crates/re_viewer_context/Cargo.toml

@@ -40,7 +40,7 @@ lazy_static.workspace = true
 macaw.workspace = true
 ndarray.workspace = true
 nohash-hasher.workspace = true
-once_cell.workapce = true
+once_cell.workspace = true
 parking_lot.workspace = true
 serde = "1"
 slotmap.workspace = true