node: crypto hash functions leak cryptoDigest resources in tests

[zookatron]

Reproduction example:

Deno version:

deno 1.31.2 (release, x86_64-unknown-linux-gnu)
v8 11.0.226.19
typescript 4.9.4

mod.ts:

import PG from "npm:pg@8.10.0";

export async function test() {
  const client = new PG.Client({connectionString: Deno.env.get("DATABASE_URL")});
  await client.connect();
  await client.end();
}

mod.test.ts:

import { test } from "./mod.ts";

Deno.test("Test", async () => {
  await test();
});

Run:

deno test --allow-net --allow-env

Expected output:

ok | 1 passed | 0 failed (53ms)

Actual Output:

error: AssertionError: Test case is leaking 4 resources:

 - A "cryptoDigest" resource (rid 8196) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
 - A "cryptoDigest" resource (rid 8200) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
 - A "cryptoDigest" resource (rid 8203) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.
 - A "cryptoDigest" resource (rid 8206) was created during the test, but not cleaned up during the test. Close the resource before the end of the test.

    at assert (ext:deno_web/00_infra.js:353:11)
    at resourceSanitizer (ext:cli/40_testing.js:417:5)
    at async Object.exitSanitizer [as fn] (ext:cli/40_testing.js:435:7)
    at async runTest (ext:cli/40_testing.js:840:5)
    at async runTests (ext:cli/40_testing.js:1098:20)

FAILED | 0 passed | 1 failed (258ms)

The cause of the issue appears to be the use of the node crypto library for hashing in the pg library, see for example https://github.com/brianc/node-postgres/blob/master/packages/pg/lib/sasl.js#L194 If any of the code paths that use these hash functions are called this error occurs.