chore(deps): update module go to 1.20 (#477)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

test/integration/go.mod

@@ -1,6 +1,6 @@
 module github.com/terraform-google-modules/terraform-google-sql-db/test/integration
 
-go 1.18
+go 1.20
 
 require (
 	github.com/GoogleCloudPlatform/cloud-foundation-toolkit/infra/blueprint-test v0.5.2