AK: Add HashMap::ensure_capacity

Author: https://github.com/mattco98
Commit: a511f1ef85
Pull-request: https://github.com/SerenityOS/serenity/pull/23486
Issue: https://github.com/SerenityOS/serenity/issues/23471
Issue: https://github.com/SerenityOS/serenity/issues/23473
Reviewed-by: https://github.com/awesomekling

AK/HashMap.h

@@ -135,6 +135,8 @@ public:
 
     ErrorOr<void> try_ensure_capacity(size_t capacity) { return m_table.try_ensure_capacity(capacity); }
 
+    void ensure_capacity(size_t capacity) { return m_table.ensure_capacity(capacity); }
+
     Optional<typename ValueTraits::ConstPeekType> get(K const& key) const
     requires(!IsPointer<typename ValueTraits::PeekType>)
     {