Update criterion requirement from 0.7 to 0.8 (#40)

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Author: dependabot[bot]

Cargo.toml

@@ -45,7 +45,7 @@ slab = "0.4"
 thiserror = "2.0"
 
 [dev-dependencies]
-criterion = { version = "0.7", features = ["html_reports"] }
+criterion = { version = "0.8", features = ["html_reports"] }
 serde = "1.0"
 serde_json = "1.0"
 proptest = "1.6"