Upgrade 50% of chromium bots to macOS 26.6.2 #192572

Request the following devices be upgraded to macOS 26.6.2

try

• mac-293-g140
• mac-294-g140
• mac-295-g140
• mac-296-g140
• mac-297-g140
• mac-298-g140
• mac-299-g140
• mac-300-g140
• mac-301-g140
• mac-302-g140
• mac-303-g140
• mac-304-g140
• mac-305-g140
• mac-306-g140
• mac-307-g140
• mac-308-g140
• mac-309-g140
• mac-310-g140
• mac-311-g140
• mac-312-g140
• mac-313-g140
• mac-314-g140
• mac-315-g140
• mac-316-g140
• mac-317-g140
• mac-318-g140
• mac-319-g140
• mac-320-g140
• mac-321-g140
• mac-322-g140
• mac-323-g140
• mac-324-g140
• mac-325-g140
• mac-326-g140
• mac-327-g140
• mac-329-g140
• mac-330-g140
• mac-331-g140
• mac-332-g140
• mac-333-g140
• mac-334-g140
• mac-335-g140
• mac-336-g140
• mac-337-g140
• mac-338-g140
• mac-339-g140
• mac-346-g140
• mac-506-g140
• mac-507-g140
• mac-508-g140
• mac-509-g140
• mac-510-g140
• mac-511-g140
• mac-512-g140
• mac-513-g140
• mac-514-g140
• mac-515-g140
• mac-516-g140
• mac-517-g140
• mac-518-g140
• mac-519-g140
• mac-520-g140
• mac-521-g140
• mac-522-g140
• mac-523-g140

staging

• mac-342-g140
• mac-343-g140
• mac-344-g140
• mac-345-g140
• mac-681-h526
• mac-682-h526
• mac-683-h526
• mac-684-h526
• mac-685-h526
• mac-686-h526
• mac-687-h526
• mac-688-h526
• mac-689-h526
• mac-690-h526
• mac-691-h526
• mac-692-h526
• mac-693-h526

prod

• mac-476-g140
• mac-477-g140
• mac-478-g140
• mac-479-g140
• mac-480-g140
• mac-481-g140
• mac-482-g140
• mac-483-g140
• mac-484-g140
• mac-485-g140
• mac-486-g140
• mac-487-g140
• mac-488-g140
• mac-489-g140
• mac-490-g140
• mac-491-g140
• mac-492-g140
• mac-493-g140
• mac-494-g140
• mac-495-g140
• mac-496-g140
• mac-497-g140
• mac-498-g140
• mac-499-g140
• mac-500-g140
• mac-501-g140
• mac-502-g140
• mac-503-g140

Filed b/568471026