Microsoft.StorageSync : Update Api Version from 2018-07-01 to 2018-10-01

[ankushbindlish2]

https://github.com/Azure/azure-rest-api-specs/blob/master/specification/storagesync/resource-manager/readme.md
PR: Azure/azure-rest-api-specs#4983
Related PRs : https://github.com/Azure/azure-rest-api-specs/pulls?utf8=%E2%9C%93&q=is:pr+storagesync

Description

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• Please add REST spec PR link to the SDK PR
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[dsgouda]

LGTM

[dsgouda]

@shahabhijeet Do we need to bump the nuget version here given this is a new REST API version?

[dsgouda]

Needs a minor versioning change

[dsgouda]

LGTM

[dsgouda]

Will merge once CIs pass