chore: update criterion to 0.8 (#396)

Update the criterion dev dependency to 0.8. Dependabot got somehow
stuck, hence do it manually.

Closes #392.

Author: vmx

codetable/Cargo.toml

@@ -39,7 +39,7 @@ arbitrary = { version = "1.3.2", optional = true, features = ["derive"] }
 [dev-dependencies]
 hex = "0.4.2"
 unsigned-varint = { version = "0.8.0", default-features = false }
-criterion = "0.7"
+criterion = "0.8"
 rand = "0.9.2"
 
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