Use the Postgres uint64 instead of the C uint64_t

[akuzm]

They are nominally different on some platforms (e.g. unsigned long vs unsigned long long), so we shouldn't mix them.

Disable-check: force-changelog-file

Since this is a trivial CI fix:
Disable-check: approval-count

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.22%. Comparing base (59f50f2) to head (6d0be0a).
Report is 679 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7573      +/-   ##
==========================================
+ Coverage   80.06%   82.22%   +2.15%     
==========================================
  Files         190      238      +48     
  Lines       37181    43716    +6535     
  Branches     9450    10968    +1518     
==========================================
+ Hits        29770    35945    +6175     
- Misses       2997     3433     +436     
+ Partials     4414     4338      -76     

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