Fixed CI

Author: ankane

.github/workflows/build.yml

@@ -28,4 +28,5 @@ jobs:
           cd test
           go mod tidy
           go generate ./ent
+          go mod tidy
           go test -v

README.md

@@ -476,6 +476,7 @@ createdb pgvector_go_test
 cd test
 go mod tidy
 go generate ./ent
+go mod tidy
 go test -v
 ```