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161: Fix sql upgrade script

Antoine R. Dumont requested to merge generated-differential-D3833-source into generated-differential-D3833-target

Prior to this commit, the existing script did not work:

swh=> rollback; begin; update revision set extra_headers = ARRAY[][] where extra_headers is null;
ROLLBACK
BEGIN
ERROR:  syntax error at or near "["
LINE 1: update revision set extra_headers = ARRAY[][] where extra_he...

With the following diff's content, on staging:

swh=> rollback; begin; update revision set extra_headers = ARRAY[]::bytea[][] where extra_headers is null;
ROLLBACK
BEGIN
UPDATE 865732
swh=> select extra_headers from revision where extra_headers = ARRAY[]::bytea[][] limit 10;
 extra_headers
 ---------------
  {}
...

I guess it's kinda related to #2524 ;)

Test Plan

manual run on staging prior to actually deploy on production

Migrated from D3833 (view on Phabricator)

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