Bump manager client to 3.2.6

[rzetelskik]

Description of your changes: This PR updates the manager client dependency version to 3.2.6.

Which issue is resolved by this Pull Request:
Prerequisite for #1798.

/kind feature
/priority important-soon
/hold for #1795

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@rzetelskik: 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/e2e-gke-parallel-clusterip	aab6d2a	link	true	/test e2e-gke-parallel-clusterip

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[tnozicka]

thx, I guess we can just bump all of them since I needed it too #1801

[rzetelskik]

thx, I guess we can just bump all of them since I needed it too #1801

From my experience the appropriate thing to do on an open PR is to request an update, not send your own.
Also I need this one backported to 1.12, is #1801 going to be? Edit: answered here #1801 (comment)

[tnozicka]

From my experience the appropriate thing to do on an open PR is to request an update, not send your own.

I've sent my PR before bumping into this one as I was fixing the CVEs and manager was just one of the deps bumped there without caring about it at all.