Upgrade smartstring crate to 1.0 version (#1030)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kai Ren <tyranron@gmail.com>

Author: dependabot[bot]

juniper/Cargo.toml

@@ -46,7 +46,7 @@ graphql-parser = { version = "0.4", optional = true }
 indexmap = { version = "1.0", features = ["serde-1"] }
 serde = { version = "1.0.8", features = ["derive"], default-features = false }
 serde_json = { version = "1.0.2", default-features = false, optional = true }
-smartstring = "0.2.6"
+smartstring = "1.0"
 static_assertions = "1.1"
 time = { version = "0.3", features = ["formatting", "macros", "parsing"], optional = true }
 url = { version = "2.0", optional = true }