Build: (0084336) fix: Remove redundant Cache getItem() call in `Aut…

…h0\SDK\Token\Verifier::getKeySet()` (#669)

* Remove unnecessary second getItem call

$item (although with an empty value) has already been created on line 198: https://github.com/auth0/auth0-PHP/blob/main/src/Token/Verifier.php#L198. We only have to save the value and expiry here.

This change will only (try) to get the value of the cache once instead of twice.

* fix: Variable scope

Co-authored-by: Evan Sims <evan.sims@okta.com>

classes/Auth0-SDK-Token-Verifier.html

@@ -797,7 +797,7 @@ <h4 class="phpdocumentor-element__name" id="method_freeKey">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/Token/Verifier.php"><a href="files/src-token-verifier.html"><abbr title="src/Token/Verifier.php">Verifier.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">280</span>
+    <span class="phpdocumentor-element-found-in__line">281</span>
 
     </aside>
 
@@ -855,7 +855,7 @@ <h4 class="phpdocumentor-element__name" id="method_getKey">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/Token/Verifier.php"><a href="files/src-token-verifier.html"><abbr title="src/Token/Verifier.php">Verifier.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">248</span>
+    <span class="phpdocumentor-element-found-in__line">249</span>
 
     </aside>