chore: knip ignore eslint config

.github/knip.ts

@@ -3,7 +3,7 @@ import type { KnipConfig } from "knip";
 const config: KnipConfig = {
   entry: ["build/index.ts", ".github/empty-string-checker.ts"],
   project: ["src/**/*.ts"],
-  ignore: ["src/types/config.ts", "**/__mocks__/**", "**/__fixtures__/**"],
+  ignore: ["src/types/config.ts", "**/__mocks__/**", "**/__fixtures__/**", "eslint.config.mjs"],
   ignoreExportsUsedInFile: true,
   // eslint can also be safely ignored as per the docs: https://knip.dev/guides/handling-issues#eslint--jest
   ignoreDependencies: ["eslint-config-prettier", "eslint-plugin-prettier", "@types/jest", "@mswjs/data"],