mod: Update rpmostree-client-go

[cgwalters]

No functional changes, but this clearly runs into the problem we're not regularly updating our dependencies...

Prep for #3857

[sinnykumari]

#3913 merged, we hshould be good to update the PR with vendoring latest deps.

[sinnykumari]

QE testing shouldn't be necessary since this is dep update.
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, sinnykumari

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 26b12a4 and 2 for PR HEAD 5803955 in total

[openshift-ci]

@cgwalters: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/okd-scos-e2e-aws-ovn	5803955	link	false	/test okd-scos-e2e-aws-ovn

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