Update google-java-format (#2570)

Also converted regex strings in the Python script to raw strings as
future Python versions will start to reject them.

See: https://docs.python.org/3/whatsnew/3.12.html#other-language-changes

java-format/google-java-format-diff.py

@@ -63,7 +63,7 @@ def main():
   lines_by_file = {}
 
   for line in sys.stdin:
-    match = re.search('^\+\+\+\ (.*?/){%s}(\S*)' % args.p, line)
+    match = re.search(r"^\+\+\+\ (.*?/){%s}(\S*)" % args.p, line)
     if match:
       filename = match.group(2)
     if filename is None:
@@ -76,7 +76,7 @@ def main():
       if not re.match('^%s$' % args.iregex, filename, re.IGNORECASE):
         continue
 
-    match = re.search('^@@.*\+(\d+)(,(\d+))?', line)
+    match = re.search(r"^@@.*\+(\d+)(,(\d+))?", line)
     if match:
       start_line = int(match.group(1))
       line_count = 1