Support hasql 1.9

.github/workflows/build.yaml

@@ -22,4 +22,4 @@ jobs:
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
     - run: nix build .#devShells.x86_64-linux.default --print-build-logs
-    - run: nix flake check --print-build-logs
+    - run: nix build .#checks.x86_64-linux.tests --print-build-logs

cabal.project.haskell-nix

@@ -2,3 +2,8 @@
 -- will interpret them as local packages, and try to build them when we cabal
 -- build. The only reason we have to specify these is for Haskell.nix to know to
 -- override these packages by fetching them rather than using Hackage.
+
+-- Workaround a build failure until the fix mentioned in https://github.com/NixOS/nixpkgs/issues/370138
+-- is merged to nixpkgs-unstable
+package postgresql-libpq
+  flags: +use-pkg-config

changelog.d/20250508_145755_kokobd_hasql_1_9.md

@@ -0,0 +1,35 @@
+<!--
+### Removed
+
+- A bullet item for the Removed category.
+
+-->
+
+### Added
+
+- Support hasql-1.9
+
+<!--
+### Changed
+
+- A bullet item for the Changed category.
+
+-->
+<!--
+### Deprecated
+
+- A bullet item for the Deprecated category.
+
+-->
+<!--
+### Fixed
+
+- A bullet item for the Fixed category.
+
+-->
+<!--
+### Security
+
+- A bullet item for the Security category.
+
+-->