fix: Safer version for FindAnyObjectByType (#3765)

Unity docs are a mess on when FindAnyObjectByType was implemented:
- 2021.3 says it is
- 2022.1 says it's not
- 2022.2 says it is

Assets/Mirror/Examples/BilliardsPredicted/Player/PlayerPredicted.cs

@@ -30,7 +30,7 @@ public class PlayerPredicted : NetworkBehaviour
         void Awake()
         {
             // find the white ball once
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             whiteBall = FindAnyObjectByType<WhiteBallPredicted>();
 #else
             // Deprecated in Unity 2023.1

Assets/Mirror/Examples/CharacterSelection/Scripts/PlayerControllerScript.cs

@@ -83,7 +83,7 @@ public override void OnStartAuthority()
             characterController.enabled = true;
             this.enabled = true;
 
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             sceneReferencer = GameObject.FindAnyObjectByType<SceneReferencer>();
 #else
             // Deprecated in Unity 2023.1

Assets/Mirror/Examples/CharacterSelection/Scripts/PlayerEmpty.cs

@@ -10,7 +10,7 @@ public class PlayerEmpty : NetworkBehaviour
         public override void OnStartAuthority()
         {
             // enable UI located in the scene, after empty player spawns in.
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             sceneReferencer = GameObject.FindAnyObjectByType<SceneReferencer>();
 #else
             // Deprecated in Unity 2023.1

Assets/Mirror/Examples/CouchCoop/Scripts/CouchPlayer.cs

@@ -26,7 +26,7 @@ public override void OnStartAuthority()
 
             if (isOwned)
             {
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
                 couchPlayerManager = GameObject.FindAnyObjectByType<CouchPlayerManager>();
 #else
                 // Deprecated in Unity 2023.1

Assets/Mirror/Examples/CouchCoop/Scripts/CouchPlayerManager.cs

@@ -23,7 +23,7 @@ public class CouchPlayerManager : NetworkBehaviour
         public override void OnStartAuthority()
         {
             // hook up UI to local player, for cmd communication
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             canvasScript = GameObject.FindAnyObjectByType<CanvasScript>();
 #else
             // Deprecated in Unity 2023.1

Assets/Mirror/Examples/MultipleMatches/Scripts/MatchController.cs

@@ -33,7 +33,7 @@ public class MatchController : NetworkBehaviour
 
         void Awake()
         {
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             canvasController = GameObject.FindAnyObjectByType<CanvasController>();
 #else
             // Deprecated in Unity 2023.1

Assets/Mirror/Examples/MultipleMatches/Scripts/MatchGUI.cs

@@ -19,7 +19,7 @@ public class MatchGUI : MonoBehaviour
 
         public void Awake()
         {
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             canvasController = GameObject.FindAnyObjectByType<CanvasController>();
 #else
             // Deprecated in Unity 2023.1

Assets/Mirror/Examples/_Common/Scripts/CanvasNetworkManagerHUD/CanvasNetworkManagerHUD.cs

@@ -188,7 +188,7 @@ private void OnClientDisconnect()
         // you first add this script to a gameobject.
         private void Reset()
         {
-#if UNITY_2021_3_OR_NEWER
+#if UNITY_2022_2_OR_NEWER
             if (!FindAnyObjectByType<NetworkManager>())
                 Debug.LogError("This component requires a NetworkManager component to be present in the scene. Please add!");
 #else