fix: superset db upgrade not working due to removal of FLAGS variable…

[LeonardSchuler]

SUMMARY

In superset/sql_parse.py sqlparse.keywords.FLAGS is used.
However, sqlparse has removed the FLAGS variable from the code sqlparse/kewords.py.

This leads to an AttributeError when running the CLI command

$ superset db upgrade
AttributeError: module 'sqlparse.keywords' has no attribute 'FLAGS'

This PR fixes that by replacing the sqlparse.keywords.FLAGS variable in sql_parse.py with the value originally defined in sqlparse.keywords.FLAGS.

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

Fixes #23742

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[github-actions]

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[Zander-1024]

emmmmm

[EugeneTorap]

superseded by #24045

[villebro]

Thanks for the fix @LeonardSchuler - as this has been superseded by #24045, we can close this PR.