Fix various issues with ecto 3.12 (#147)
* Make expr function private
* Support column type integer
* Bump locked dependencies
* Fix issue ByExpr
closes: #146
* Swap in `Enum.map_intersperse/3`
* Tag constraint test to keep with upstream
* SQLite doesn't suffer from this issue anymore
* Simplify default_expr to no longer consider type
* Fix integration test setup
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