deps: update scylla manager deps to take them from master branch

[karol-kokoszka]

When managerclient was being extracted to separate submodule, it required on scylla-manager to go get the extracted submodules.
During the development, go get was done with commits from non-master branch.
It can break the builds of siren.

This PR, go gets the dependencies from master.

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Please make sure that:

• Code is split to commits that address a single change
• Commit messages are informative
• Commit titles have module prefix
• Commit titles have issue nr. suffix