Update sigs.yml

Author: arminru

sigs.yml

@@ -397,7 +397,7 @@
        - name: Morgan McLean
          github: mtwo
   - name: '.NET: SDK'
-    meeting: Tuesday alternating between 09:00 PT and 16:00 PT
+    meeting: Tuesday at 11:00 PT
     notes:
       type: gDoc
       value: 1yjjD6aBcLxlRazYrawukDgrhZMObwHARJbB9glWdHj8