Build with Go 1.19.3

This includes a small selection of security-related fixes which do not
urgently impact Terraform's behavior but do close some potential avenues
for unbounded resource usage or misbehavior with malicious input:

 - golang/go#54853
 - golang/go#55949
 - golang/go#56284

.go-version

@@ -1 +1 @@
-1.19.1
+1.19.3