Update Data Sources (#646)

Author: jmertic

_data/meeting-agenda-items.csv

@@ -22,3 +22,5 @@ Mentorship Program Submissions,https://github.com/openmainframeproject/tac/issue
 Mainframe infrastructure coming online status,https://github.com/openmainframeproject/tac/issues/596,596,Next Meeting Agenda Items
 CD Foundation Best Practices SIG,https://github.com/openmainframeproject/tac/issues/460,460,On Hold
 z/OS Open Tools,https://github.com/openmainframeproject/tac/issues/625,625,Future Meeting Agenda Items
+MainframeGPT,https://github.com/openmainframeproject/tac/issues/644,644,On Hold
+AI for mainframe: COBOL ML model creation,https://github.com/openmainframeproject/tac/issues/642,642,Future Meeting Agenda Items