Release .build_version file handle in Android custom build export

(cherry picked from commit b271315bac2518217b09a78054780db01d5796fb)

platform/android/export/export.cpp

@@ -2658,15 +2658,18 @@ public:
 
 		if (use_custom_build) {
 			//test that installed build version is alright
-			FileAccessRef f = FileAccess::open("res://android/.build_version", FileAccess::READ);
-			if (!f) {
-				EditorNode::get_singleton()->show_warning(TTR("Trying to build from a custom built template, but no version info for it exists. Please reinstall from the 'Project' menu."));
-				return ERR_UNCONFIGURED;
-			}
-			String version = f->get_line().strip_edges();
-			if (version != VERSION_FULL_CONFIG) {
-				EditorNode::get_singleton()->show_warning(vformat(TTR("Android build version mismatch:\n   Template installed: %s\n   Godot Version: %s\nPlease reinstall Android build template from 'Project' menu."), version, VERSION_FULL_CONFIG));
-				return ERR_UNCONFIGURED;
+			{
+				FileAccessRef f = FileAccess::open("res://android/.build_version", FileAccess::READ);
+				if (!f) {
+					EditorNode::get_singleton()->show_warning(TTR("Trying to build from a custom built template, but no version info for it exists. Please reinstall from the 'Project' menu."));
+					return ERR_UNCONFIGURED;
+				}
+				String version = f->get_line().strip_edges();
+				f->close();
+				if (version != VERSION_FULL_CONFIG) {
+					EditorNode::get_singleton()->show_warning(vformat(TTR("Android build version mismatch:\n   Template installed: %s\n   Godot Version: %s\nPlease reinstall Android build template from 'Project' menu."), version, VERSION_FULL_CONFIG));
+					return ERR_UNCONFIGURED;
+				}
 			}
 			String sdk_path = EDITOR_GET("export/android/custom_build_sdk_path");
 			ERR_FAIL_COND_V_MSG(sdk_path == "", ERR_UNCONFIGURED, "Android SDK path must be configured in Editor Settings at 'export/android/custom_build_sdk_path'.");