[release] test/integration: increase installation test timeout

We are observing occasional failures from test timeout

Change-Id: Icb45338e60fb9a4b8da3d69c0cbd877d5fdb7e9b
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/284194
Trust: Hyang-Ah Hana Kim <[email protected]>
Run-TryBot: Hyang-Ah Hana Kim <[email protected]>
TryBot-Result: kokoro <[email protected]>
Reviewed-by: Suzy Mueller <[email protected]>

Author: hyangah

test/integration/install.test.ts

@@ -22,7 +22,7 @@ import { correctBinname } from '../../src/utils/pathUtils';
 
 suite('Installation Tests', function () {
 	// Disable timeout when we are running slow tests.
-	let timeout = 10000;
+	let timeout = 60000;
 	if (shouldRunSlowTests()) {
 		timeout = 0;
 	}