Redfish: Fix bug that cause validator failed

MaxImageSizeBytes was added in this commit:
https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/43775
but the UpdateService version number was not changed.

MaxImageSizeBytes in UpdateService belongs to UpdateService.v1_5_0.json

https://redfish.dmtf.org/schemas/v1/UpdateService.v1_5_0.json



Tested: Validator passes

Signed-off-by: Chicago Duan <duanzhijia01@inspur.com>
Change-Id: I68f01ce5fb8f8e715c0e0fad6a34ab609acca01b