Bump gorm.io/driver/postgres from 1.1.0 to 1.1.1 in /tests

Bumps [gorm.io/driver/postgres](https://github.com/go-gorm/postgres) from 1.1.0 to 1.1.1.
- [Release notes](https://github.com/go-gorm/postgres/releases)
- [Commits](go-gorm/postgres@v1.1.0...v1.1.1)

---
updated-dependencies:
- dependency-name: gorm.io/driver/postgres
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

tests/go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/jinzhu/now v1.1.2
 	github.com/lib/pq v1.10.3
 	gorm.io/driver/mysql v1.1.2
-	gorm.io/driver/postgres v1.1.0
+	gorm.io/driver/postgres v1.1.1
 	gorm.io/driver/sqlite v1.1.5
 	gorm.io/driver/sqlserver v1.0.9
 	gorm.io/gorm v1.21.15