Specify the update target version

Default policy is empty. If this policy is empty or invalid, client will ignore this policy. If this policy is a valid string, client will use this string as the update target version. If the Zoom's version is lower than the specific version, the client will auto update to the specific version. If the Zoom's version is higher than the specific version, the client will not do anything. The format of this string should be major.minor.patch.build, for example: "5.10.4.5035" If this policy is not set, client will use the default setting.