net/libmdf: update to 1.0.27

Changes in release 1.0.27:

• Support strings compressed with zstd
• changed how the size of the read buffer is increased in response to the widening of the tcp/ip window.
• small optimization in mdf_get_next_message2()
• New functions:
  • mdf_extract() : extracts the current message from the mdf handle.
  • mdf_inject() : injects a previously extracted message to the mdf handle.
• New properties:
  • MDF_OPT_RBUF_SIZE : returns the number of bytes waiting to be processed in the internaly read buffer after a call to mdf_consume().
  • MDF_OPT_RBUF_MAXSIZE : returns or sets the current size of the internal read buffer.

PR: 271464