Fix presubmit copyright regex to allow the year 2020

Change-Id: I4258a218e9b2bbba5b9d14eccc9c6779e701e793
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1986248
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65583}

tools/v8_presubmit.py

@@ -382,7 +382,7 @@ class TorqueLintProcessor(CacheableSourceFileProcessor):
     return None, arguments
 
 COPYRIGHT_HEADER_PATTERN = re.compile(
-    r'Copyright [\d-]*20[0-1][0-9] the V8 project authors. All rights reserved.')
+    r'Copyright [\d-]*20[0-2][0-9] the V8 project authors. All rights reserved.')
 
 class SourceProcessor(SourceFileProcessor):
   """