Use OpenBrush with ink! v4 beta (could not find `metadata` in `ink`)

[wottpal]

hey, i'm trying out ink! v4.0.0-beta right now and want to use OpenBrush with it. how do i install it as a dependency from the update-to-ink-4.0.0-beta branch?

[wottpal]

Update: I might got it working via a dependency import in Cargo.toml like:

openbrush = { git = "https://github.com/Supercolony-net/openbrush-contracts", branch = "feature/update-to-ink-4.0.0-beta", default-features = false, features = ["psp34"] }

But now, during the build I get the following error:

error[E0433]: failed to resolve: could not find `metadata` in `ink`
  --> /Users/…/.cargo/git/checkouts/openbrush-contracts-67504c0ed06fb3b5/34f8308/lang/src/storage/mapping.rs:28:10
   |
28 | use ink::metadata::layout::RootLayout;
   |          ^^^^^^^^ could not find `metadata` in `ink`

error[E0433]: failed to resolve: could not find `metadata` in `ink`
  --> /Users/…/.cargo/git/checkouts/openbrush-contracts-67504c0ed06fb3b5/34f8308/lang/src/storage/multi_mapping.rs:30:5
   |
30 |     metadata::layout::RootLayout,
   |     ^^^^^^^^ could not find `metadata` in `ink`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `openbrush_lang` due to 2 previous errors

[wottpal]

This is the full Cargo.toml:

[package]
name = "azns_registry"
version = "0.0.2"
authors = ["AZERO Domains <hello@azero.domains>"]
edition = "2021"
publish = false

[dependencies]
scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["derive"] }
scale-info = { version = "2.3", default-features = false, features = ["derive"], optional = true }

ink = { version = "4.0.0-beta", default-features = false }

openbrush = { git = "https://github.com/Supercolony-net/openbrush-contracts", branch = "feature/update-to-ink-4.0.0-beta", default-features = false, features = ["psp34"] }

azns_name_checker = { path = "../azns_name_checker", default-features = false, features = ["ink-as-dependency"] }

[lib]
name = "azns_registry"
path = "lib.rs"
crate-type = ["cdylib"]

[features]
default = ["std"]
std = [
    "scale/std",
    "scale-info/std",
    "ink/std",
    "openbrush/std",
    "azns_name_checker/std",
]
ink-as-dependency = []