test: ignore EPIPE errors in https proxy invalid URL test

test/client-proxy/test-https-proxy-request-invalid-char-in-url.mjs

@@ -82,7 +82,19 @@ for (const testCase of testCases) {
           proxy.close();
           server.close();
           assert.deepStrictEqual(requests, expectedUrls);
-          assert.deepStrictEqual(new Set(logs), expectedProxyLogs);
+          const logSet = new Set(logs);
+          for (const log of logSet) {
+            if (log.source === 'proxy connect' && log.error?.code === 'EPIPE') {
+              // There can be a race from eagerly shutting down the servers and severing
+              // two pipes at the same time but for the purpose of this test, we only
+              // care about whether the requests are initiated from the client as expected,
+              // not how the upstream/proxy servers behave. Ignore EPIPE errors from them..
+              // Refs: https://github.com/nodejs/node/issues/59741
+              console.log('Ignoring EPIPE error from proxy connect', log.error);
+              logSet.delete(log);
+            }
+          }
+          assert.deepStrictEqual(logSet, expectedProxyLogs);
         }));
       }
     }));