[chore] remove json-iterator from direct dependencies (open-telemetry#44069)

this dependency is only used in testing, it can be removed.

Author: atoulme

receiver/splunkhecreceiver/go.mod

@@ -6,7 +6,6 @@ require (
 	github.com/goccy/go-json v0.10.5
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/mux v1.8.1
-	github.com/json-iterator/go v1.1.12
 	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/splunkhecexporter v0.139.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/extension/ackextension v0.139.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/common v0.139.0
@@ -49,6 +48,7 @@ require (
 	github.com/google/go-tpm v0.9.6 // indirect
 	github.com/hashicorp/go-version v1.7.0 // indirect
 	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.18.1 // indirect
 	github.com/knadh/koanf/maps v0.1.2 // indirect
 	github.com/knadh/koanf/providers/confmap v1.0.0 // indirect

receiver/splunkhecreceiver/receiver_test.go

@@ -17,7 +17,6 @@ import (
 	"testing"
 	"time"
 
-	jsoniter "github.com/json-iterator/go"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/collector/component"
@@ -1814,7 +1813,7 @@ func Test_splunkhecreceiver_handle_nested_fields(t *testing.T) {
 			currentTime := float64(time.Now().UnixNano()) / 1e6
 			event := buildSplunkHecMsg(currentTime, 3)
 			event.Fields["nested_map"] = tt.field
-			msgBytes, err := jsoniter.Marshal(event)
+			msgBytes, err := json.Marshal(event)
 			require.NoError(t, err)
 			req := httptest.NewRequest(http.MethodPost, "http://localhost/services/collector", bytes.NewReader(msgBytes))