Fix missing feature flags for benchmarks (#2515)

Unbreaking `main`

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PR Build Summary: https://build.rerun.io/pr/2515

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Docs preview: https://rerun.io/preview/9cd1c36/docs
Examples preview: https://rerun.io/preview/9cd1c36/examples
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crates/re_components/Cargo.toml

@@ -63,7 +63,7 @@ uuid = { version = "1.1", features = ["serde", "v4", "js"] }
 ecolor = { workspace = true, optional = true }
 glam = { workspace = true, optional = true }
 image = { workspace = true, optional = true, default-features = false }
-rand = { workspace = true, optional = true }
+rand = { workspace = true, optional = true, features = ["std", "std_rng"] }
 serde = { version = "1", optional = true, features = ["derive", "rc"] }
 zune-core = { version = "0.2", optional = true }
 zune-jpeg = { version = "0.3", optional = true }

crates/re_sdk_comms/Cargo.toml

@@ -33,6 +33,6 @@ re_smart_channel.workspace = true
 ahash.workspace = true
 crossbeam.workspace = true
 document-features = "0.2"
-rand = { workspace = true, features = ["small_rng"] }
+rand = { workspace = true, features = ["std", "std_rng", "small_rng"] }
 thiserror.workspace = true
 tokio.workspace = true