main/xmlto: upgrade to 0.0.29
This version fixes -Wimplicit-int issues with GCC 14:
https://www.pagure.io/xmlto/c/1375e2df75530cd198bd16ac3de38e2b0d126276
https://www.pagure.io/xmlto/c/8e34f087bf410bcc5fe445933d6ad9bae54f24b5
This version fixes -Wimplicit-int issues with GCC 14:
https://www.pagure.io/xmlto/c/1375e2df75530cd198bd16ac3de38e2b0d126276
https://www.pagure.io/xmlto/c/8e34f087bf410bcc5fe445933d6ad9bae54f24b5