feat: Bumping template to use fuels v0.48.0 (#5181)

## Description
- Bump harness template to v0.48.0 for [intro-to-sway
guide](FuelLabs/docs-hub#55)
- Used auto loading [storage slots
](FuelLabs/fuels-rs#1120)

## Checklist

- [x] I have linked to any relevant issues.
- [ ] I have commented my code, particularly in hard-to-understand
areas.
- [x] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [x] I have added tests that prove my fix is effective or that my
feature works.
- [x] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

Co-authored-by: Igor Rončević <[email protected]>

templates/sway-test-rs/template/Cargo.toml

@@ -7,7 +7,7 @@ authors = ["{{authors}}"]
 license = "Apache-2.0"
 
 [dev-dependencies]
-fuels = { version = "0.47", features = ["fuel-core-lib"] }
+fuels = { version = "0.48", features = ["fuel-core-lib"] }
 tokio = { version = "1.12", features = ["rt", "macros"] }
 
 [[test]]

templates/sway-test-rs/template/tests/harness.rs

@@ -20,12 +20,7 @@ async fn get_contract_instance() -> (MyContract<WalletUnlocked>, ContractId) {
     .await;
     let wallet = wallets.pop().unwrap();
 
-    let storage_config =
-        StorageConfiguration::load_from("out/debug/{{project-name}}-storage_slots.json").unwrap();
-
-    let load_config = LoadConfiguration::default().with_storage_configuration(storage_config);
-
-    let id = Contract::load_from("./out/debug/{{project-name}}.bin", load_config)
+    let id = Contract::load_from("./out/debug/{{project-name}}.bin", LoadConfiguration::default())
     .unwrap()
     .deploy(&wallet, TxParameters::default())
     .await