Fix cargo features

* `bdk_chain/std` should also enable `miniscript/std`
* use the version of `hashbrown` that `bitcoin` and `miniscript` is
  using

crates/chain/Cargo.toml

@@ -13,18 +13,19 @@ readme = "README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+# For no-std, remember to enable the bitcoin/no-std feature
 bitcoin = { version = "0.29", default-features = false }
 serde_crate = { package = "serde", version = "1", optional = true, features = ["derive"] }
 
 # Use hashbrown as a feature flag to have HashSet and HashMap from it.
 # note version 0.13 breaks outs MSRV.
-hashbrown = { version = "0.12", optional = true, features = ["serde"] }
+hashbrown = { version = "0.11", optional = true, features = ["serde"] }
 miniscript = { version = "9.0.0", optional = true, default-features = false }
 
 [dev-dependencies]
 rand = "0.8"
 
 [features]
 default = ["std"]
-std = ["bitcoin/std"]
-serde = ["serde_crate", "bitcoin/serde" ]
+std = ["bitcoin/std", "miniscript/std"]
+serde = ["serde_crate", "bitcoin/serde"]