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Remove unicode character in comment

Aqu requested to merge remove_unicode_character into main

When serializing the dag, this Unicode char ⚠ makes the MySQL encoder crash. It happens only in production, where we encode to Maria DB.

Here is the end of the stack trace:

File "/usr/lib/airflow/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 608, in do_execute
    cursor.execute(statement, parameters)
  File "/usr/lib/airflow/lib/python3.7/site-packages/MySQLdb/cursors.py", line 199, in execute
    args = tuple(map(db.literal, args))
  File "/usr/lib/airflow/lib/python3.7/site-packages/MySQLdb/connections.py", line 280, in literal
    s = self.string_literal(o.encode(self.encoding))
  File "/usr/lib/airflow/lib/python3.7/encodings/cp1252.py", line 12, in encode
    return codecs.charmap_encode(input,errors,encoding_table)
UnicodeEncodeError: 'charmap' codec can't encode character '\u26a0' in position 2654: character maps to <undefined>

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