chore: fix default-feature warning for forc-client (FuelLabs#4681)

## Description

Fixes the following warning by moving `default-features = false` to
workspace level:

```
warning: /Users/kayagokalp/fuel/dev/sway/forc-plugins/forc-client/Cargo.toml: `default-features` is ignored for fuel-core-client, since `default-features` was not specified for `workspace.dependencies.fuel-core-client`, this could become a hard error in the future
```

Cargo.toml

@@ -38,7 +38,7 @@ fuel-asm = "0.31.1"
 fuel-crypto = "0.31.1"
 fuel-types = "0.31.1"
 fuel-tx = "0.31.1"
-fuel-core-client = "0.18.2"
+fuel-core-client = { version = "0.18.2", default-features = false }
 fuel-vm = "0.31.2"
 fuels-core = "0.43"
 fuels-accounts = "0.43"

forc-plugins/forc-client/Cargo.toml

@@ -19,7 +19,7 @@ forc-pkg = { version = "0.40.1", path = "../../forc-pkg" }
 forc-tracing = { version = "0.40.1", path = "../../forc-tracing" }
 forc-tx = { version = "0.40.1", path = "../forc-tx" }
 forc-util = { version = "0.40.1", path = "../../forc-util" }
-fuel-core-client = { workspace = true, default-features = false }
+fuel-core-client = { workspace = true }
 fuel-crypto = { workspace = true }
 fuel-tx = { workspace = true, features = ["builder"] }
 fuel-vm = { workspace = true }