polkadot-omni-node-lib: remove unused dep (#6889)

# Description

Redundant dep that made its way in #6450 . 

. It can be
brought up when using `cargo udeps`. Added a github action that runs
`cargo udeps` on the repo too.

## Integration

N/A

## Review Notes

N/A

---------

Signed-off-by: Iulian Barbu <iulian.barbu@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>

Cargo.lock

@@ -18160,7 +18160,6 @@ dependencies = [
  "sp-timestamp 26.0.0",
  "sp-transaction-pool 26.0.0",
  "sp-version 29.0.0",
- "sp-wasm-interface 20.0.0",
  "sp-weights 27.0.0",
  "substrate-frame-rpc-system",
  "substrate-prometheus-endpoint",

cumulus/polkadot-omni-node/lib/Cargo.toml

@@ -70,7 +70,6 @@ sp-api = { workspace = true, default-features = true }
 sp-consensus = { workspace = true, default-features = true }
 sp-consensus-aura = { workspace = true, default-features = true }
 sp-io = { workspace = true, default-features = true }
-sp-wasm-interface = { workspace = true, default-features = true }
 sc-consensus-manual-seal = { workspace = true, default-features = true }
 sc-sysinfo = { workspace = true, default-features = true }
 prometheus-endpoint = { workspace = true, default-features = true }

prdoc/pr_6889.prdoc

+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Remove polkadot-omni-node-lib unused dependency 
+
+doc:
+  - audience: Node Dev
+    description: 
+      Removed an unused dependency for `polkadot-omni-node-lib`.
+
+crates:
+  - name: polkadot-omni-node-lib
+    bump: patch