test: replace gc(true) with gc({ type: 'minor' })

V8 considers gc(true) legacy, and the new signature is much more
expressive.

PR-URL: #43493
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

test/node-api/test_buffer/test_finalizer.js

@@ -16,7 +16,7 @@ process.on('uncaughtException', common.mustCall((err) => {
       throw new Error('finalizer error');
     }));
   }
-  global.gc(true);
+  global.gc({ type: 'minor' });
   await tick(common.platformTimeout(100));
   global.gc();
   await tick(common.platformTimeout(100));

test/parallel/test-net-write-fully-async-buffer.js

@@ -23,7 +23,7 @@ const server = net.createServer(common.mustCall(function(conn) {
       }
 
       while (conn.write(Buffer.from(data)));
-      global.gc(true);
+      global.gc({ type: 'minor' });
       // The buffer allocated above should still be alive.
     }
 

test/parallel/test-net-write-fully-async-hex-string.js

@@ -21,7 +21,7 @@ const server = net.createServer(common.mustCall(function(conn) {
       }
 
       while (conn.write(data, 'hex'));
-      global.gc(true);
+      global.gc({ type: 'minor' });
       // The buffer allocated inside the .write() call should still be alive.
     }