fix: getBoundingClientRect undefined check

[pinpong]

Fix #2494 because !== null not checking if undefined
I have the same error after updating to RN0.82.0-rc4

[mgcrea]

This is now crashing in 0.82.0:

Proper fix imo:

diff --git a/src/hooks/useBoundingClientRect.ts b/src/hooks/useBoundingClientRect.ts
index cc85c8ced2de8ec514360368ed20af733f8f9aec..cb92a016d67215a65a1d2b9ce710d6be34a36a6b 100644
--- a/src/hooks/useBoundingClientRect.ts
+++ b/src/hooks/useBoundingClientRect.ts
@@ -56,7 +56,7 @@ export function useBoundingClientRect(
     }
 
     // @ts-ignore 👉 https://github.com/facebook/react/commit/53b1f69ba
-    if (ref.current.unstable_getBoundingClientRect !== null) {
+    if (typeof ref.current.unstable_getBoundingClientRect === "function") {
       // @ts-ignore https://github.com/facebook/react/commit/53b1f69ba
       const layout = ref.current.unstable_getBoundingClientRect();
       handler(layout);
@@ -64,7 +64,7 @@ export function useBoundingClientRect(
     }
 
     // @ts-ignore once it `unstable_getBoundingClientRect` gets stable 🤞.
-    if (ref.current.getBoundingClientRect !== null) {
+    if (typeof ref.current.getBoundingClientRect === "function") {
       // @ts-ignore once it `unstable_getBoundingClientRect` gets stable.
       const layout = ref.current.getBoundingClientRect();
       handler(layout);