Add myself to heap/ watchlist

Change-Id: I0b352c8a34f222c904b8cc72db1e315fc7ca48df
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3268297Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77768}

WATCHLISTS

@@ -60,7 +60,7 @@
     'feature_shipping_status': {
       'filepath': 'src/flags/flag-definitions.h',
     },
-    'gc_changes': {
+    'heap_changes': {
       'filepath': 'src/heap/',
     },
     'arm': {
@@ -133,8 +133,9 @@
     'feature_shipping_status': [
       'hablich@chromium.org',
     ],
-    'gc_changes': [
+    'heap_changes': [
       'hpayer@chromium.org',
+      'mlippautz+watch@chromium.org',
     ],
     'arm': [
       'v8-mips-ports@googlegroups.com',