fix: Alembic migration head

[john-bodley]

SUMMARY

This PR fixes an issue where previously there were two Alembic heads.

BEFORE

$ FLASK_DEBUG=true superset db heads
e0f6f91c2055 (head)
ee179a490af9 (head)

i.e., the history of the two heads were:

e0f6f91c2055 <- bf646a0c1501 <- a23c6f8b1280 <- 863adcf72773
ee179a490af9 <- a23c6f8b1280

AFTER

$ FLASK_DEBUG=true superset db heads
ee179a490af9 (head)

whereas after the change, i.e, making the down revision of ee179a490af9 to be e0f6f91c2055 the history is:

ee179a490af9 <- e0f6f91c2055 <- bf646a0c1501 <- a23c6f8b1280 <- 863adcf72773

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI.

ADDITIONAL INFORMATION

• 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

[codecov]

Codecov Report

Merging #24832 (f7bfd63) into master (7cd317f) will increase coverage by 13.56%.
The diff coverage is n/a.

❗ Current head f7bfd63 differs from pull request most recent head a9f2647. Consider uploading reports for the commit a9f2647 to get more accurate results

@@             Coverage Diff             @@
##           master   #24832       +/-   ##
===========================================
+ Coverage   55.43%   68.99%   +13.56%     
===========================================
  Files        1903     1903               
  Lines       74077    74077               
  Branches     8194     8194               
===========================================
+ Hits        41064    51112    +10048     
+ Misses      30892    20844    -10048     
  Partials     2121     2121               

Flag	Coverage Δ
hive	54.13% <ø> (?)
mysql	79.21% <ø> (?)
postgres	79.31% <ø> (?)
presto	54.03% <ø> (?)
python	83.36% <ø> (+28.37%)	⬆️
sqlite	77.88% <ø> (?)
unit	54.99% <ø> (ø)

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[dpgaspar]

Thank you!