Fixed CI

Author: ankane

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: haskell-actions/setup@v2
         with:
-          ghc-version: "9.14"
+          ghc-version: "9.12"
       - uses: ankane/setup-postgres@v1
         with:
           database: pgvector_haskell_test