Use Node.js attributes instead of import assertions (removed on v22)

See: https://stackoverflow.com/a/78876692
Signed-off-by: Juan Cruz Viotti <[email protected]>

implementations/ajv/main.mjs

@@ -1,5 +1,5 @@
 import Ajv from 'ajv';
-import draft4schema from 'ajv/lib/refs/json-schema-draft-04.json' assert { type: 'json' };
+import draft4schema from 'ajv/lib/refs/json-schema-draft-04.json' with { type: 'json' };
 import fs from 'fs';
 import readline from 'readline';
 import { performance } from 'perf_hooks';