fix: add explicit types to fuzz env constants for Biome useExplicitType

Author: veillette

tests/fuzz/fuzz.spec.ts

@@ -9,7 +9,7 @@
 
 import { expect, test } from "@playwright/test";
 
-const FUZZ_DURATION = parseInt(process.env["FUZZ_DURATION"] || "15", 10) * 1000;
+const FUZZ_DURATION: number = parseInt(process.env["FUZZ_DURATION"] || "15", 10) * 1000;
 const FUZZ_SEED: string = process.env["FUZZ_SEED"] || Math.floor(Math.random() * 1_000_000).toString();
 const FUZZ_RATE: string = process.env["FUZZ_RATE"] || "100";
 const FUZZ_POINTERS: string = process.env["FUZZ_POINTERS"] || "1";