Update dataloader crate from 0.17 to 0.18 version (#1290)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

benches/Cargo.toml

@@ -6,7 +6,7 @@ authors = ["Christoph Herzog <[email protected]>"]
 publish = false
 
 [dependencies]
-dataloader = "0.17" # for Book only
+dataloader = "0.18" # for Book only
 futures = "0.3"
 juniper = { path = "../juniper" }