Add @kapetanios55 as code owner for Tools/Microsoft-Sentinel-Training-Lab

Per Andreas Kapetaniou's request, grant PR approval rights for the Microsoft Sentinel Training Lab folder, scoped to Tools/Microsoft-Sentinel-Training-Lab/.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: oshezaf

CODEOWNERS

@@ -22,6 +22,7 @@
 /Workbooks/ @Azure/sentinel-repo-books-reviewers @Azure/sentinel-repo-admins @Azure/sentinel-repo-reviewers
 /Solutions/HoneyTokens/ @haneuvir
 /Solutions/SAP/ @udidekel
+/Tools/Microsoft-Sentinel-Training-Lab/ @kapetanios55 @Azure/sentinel-repo-admins @Azure/sentinel-repo-reviewers
 /Solutions/ @Azure/sentinel-repo-solution-reviewers @Azure/sentinel-repo-admins @Azure/sentinel-repo-reviewers