docs: update since comment to refer 7.2

Co-authored-by: Aki Hamano <54422211+t-hamano@users.noreply.github.com>

Author: yashjawale

src/wp-includes/block-bindings.php

@@ -135,7 +135,7 @@ function get_block_bindings_source( string $source_name ) {
  *
  * @since 6.9.0
  * @since 7.1.0 Added support for the List Item block.
- * @since 7.1.0 Added support for the Icon block.
+ * @since 7.2.0 Added support for the Icon block.
  *
  * @param string $block_type The block type whose supported attributes are being retrieved.
  * @return array The list of block attributes that are supported by block bindings.