core: Process HTTP/1.x requests with a higher minor version like HTTP…

[arturobernalg]

…/1.1.

h1_post_read_request() added the HTTP1_BODY_IN filter only for proto_num <= 1.1, so a request such as "GET / HTTP/1.2" blocked reading its body. Use the major version, as RFC 9110 section 2.5 requires.

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• [ X] This PR does not report or address a security vulnerability
  (see SECURITY.md and
  https://www.apache.org/security/#reporting-a-vulnerability).
• [ X] Code follows the httpd style guide.
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• [X ] Test cases based on pyhttpd are included where appropriate, in the
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