verb-send-request-on-point doesn't correctly work for source blocks

[agzam]

verb-send-request-on-point works for both - tree-structured and source-block approaches. But it doesn't seem to correctly detect the source block at point, when there are multiple within the same heading, i.e.,

* Testing requests :verb:
 template https://api.thecatapi.com/v1

** subheading
    #+begin_src verb :wrap src json :op send get-body
    GET /breeds
    #+end_src
    
    #+begin_src verb :wrap src json :op send get-body
    GET /sources
    #+end_src

when the cursor is at the second source code, running verb-send-request-on-point should work for the second one, currently, it sends the request for the first source block. That basically makes problematic to keep multiple source blocks within the same heading.

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verb-export-request-on-point-curl, as it looks like, also has the same issue, it doesn't correctly detect the source block at point.