SaveBulkState panic: error saving state: rpc error: code = Internal desc = failed saving state in state store statestore: no item was updated

**Describe the bug**
When I use state.postgresql as statestore,save data failed.
When I use redis statestore,save data success.

**To Reproduce**
postgres.yaml statestore config file:
```yaml
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
name: statestore
spec:
type: state.postgresql
version: v1
metadata:
- name: connectionString
value: "host=localhost user=root password=password port=5432 connect_timeout=10 database=statestore"
- name: actorStateStore
value: "true"
```
redis.yaml statestore config file:
```yaml
apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
name: statestore
spec:
type: state.redis
version: v1
metadata:
- name: redisHost
value: localhost:6379
- name: redisPassword
value: ""
- name: actorStateStore
value: "true"

```
app code is:
```go

func main() {
client, err := dapr.NewClient()
if err != nil {
panic(err)
}
defer client.Close()
//TODO: use the client here, see below for examples
ctx := context.Background()
store := "statestore" // defined in the component YAML
data := []byte("hello")

item1 := &dapr.SetStateItem{
Key: "key11",
Etag: &dapr.ETag{
Value: "1",
},
Metadata: map[string]string{
"created-on": time.Now().UTC().String(),
},
Value: []byte("hello"),
Options: &dapr.StateOptions{
Concurrency: dapr.StateConcurrencyLastWrite,
Consistency: dapr.StateConsistencyStrong,
},
}

item2 := &dapr.SetStateItem{
Key: "key21",
Metadata: map[string]string{
"created-on": time.Now().UTC().String(),
},
Value: []byte("hello again"),
}

item3 := &dapr.SetStateItem{
Key: "key31",
Etag: &dapr.ETag{
Value: "1",
},
Value: []byte("hello again"),
}

if err := client.SaveBulkState(ctx, store, item1, item2, item3); err != nil {
panic(err)
}
keys := []string{"key11", "key21", "key31"}
_, err = client.GetBulkState(ctx, store, keys, nil, 100)
if err != nil {
panic(err)
}
}
error:
== APP == dapr client initializing for: 127.0.0.1:51916
== APP == panic: error saving state: rpc error: code = Internal desc = failed saving state in state store statestore: no item was updated
== APP ==
== APP == goroutine 1 [running]:
== APP == main.main()
== APP == I:/MyProjects/main.go:71 +0xafd
== APP == exit status 2
== APP == data [key:key1 etag:775]: hello

**Expected behavior**
Need SaveBulkState success