[graphql/rpc] easy/chore: fix workspace import (MystenLabs#14489)

## Description 

Fixes comment from here
MystenLabs#14420 (comment)

## Test Plan 

Existing 
---
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### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

Cargo.toml

@@ -408,6 +408,7 @@ rustyline = "9.1.2"
 rustyline-derive = "0.7.0"
 schemars = { version = "0.8.10", features = ["either"] }
 scopeguard = "1.1"
+serial_test = "2.0.0"
 serde = { version = "1.0.144", features = ["derive", "rc"] }
 serde-name = "0.2.1"
 serde-reflection = "0.3.6"

crates/sui-graphql-rpc/Cargo.toml

@@ -28,7 +28,7 @@ prometheus.workspace = true
 rand.workspace = true # todo: cleanup test only deps
 regex.workspace = true
 reqwest.workspace = true
-serial_test = { version = "2.0.0"}
+serial_test.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 serde_with.workspace = true