Merge branch '5.4' into 6.0

* 5.4:
  [Cache] Add missing return type
  [5.2] Add missing `@return` annotations
  [4.4] Add missing `@return` annotations
  Handle lock with long key
  #42227 update phpdoc to recommend createIndex over ensureIndex

Author: nicolas-grekas

Data/Util/ArrayAccessibleResourceBundle.php

@@ -44,17 +44,17 @@ public function offsetExists(mixed $offset): bool
         return null !== $this->bundleImpl->get($offset);
     }
 
-    public function offsetGet(mixed $offset)
+    public function offsetGet(mixed $offset): mixed
     {
         return $this->get($offset);
     }
 
-    public function offsetSet(mixed $offset, mixed $value)
+    public function offsetSet(mixed $offset, mixed $value): void
     {
         throw new BadMethodCallException('Resource bundles cannot be modified.');
     }
 
-    public function offsetUnset(mixed $offset)
+    public function offsetUnset(mixed $offset): void
     {
         throw new BadMethodCallException('Resource bundles cannot be modified.');
     }

Data/Util/RingBuffer.php

@@ -49,6 +49,8 @@ public function offsetExists(mixed $key): bool
 
     /**
      * {@inheritdoc}
+     *
+     * @return mixed
      */
     public function offsetGet(mixed $key)
     {
@@ -61,6 +63,8 @@ public function offsetGet(mixed $key)
 
     /**
      * {@inheritdoc}
+     *
+     * @return void
      */
     public function offsetSet(mixed $key, mixed $value)
     {
@@ -76,6 +80,8 @@ public function offsetSet(mixed $key, mixed $value)
 
     /**
      * {@inheritdoc}
+     *
+     * @return void
      */
     public function offsetUnset(mixed $key)
     {