add changelog

Signed-off-by: lou <[email protected]>

changelogs/unreleased/6634-27149chen

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+Fixes #6498. Get resource client again after restore actions in case resource's gv is changed. This is an improvement of pr #6499, to support group changes. A group change usually happens in a restore plugin which is used for resource conversion: convert a resource from a not supported gv to a supported gv