Update `controller-runtime` to v.0.20.X

[AndreiBarbuOz]

/kind cleanup

What needs cleanup:
Controller runtime introduced breaking changes in v.0.20.0 https://github.com/kubernetes-sigs/controller-runtime/releases/tag/v0.20.0 and importing cluster-api-provider-azure breaks the build, so we have to resort to pinning the controller-runtime to an older version

Describe the solution you'd like
Remove references to the deprecated interfaces

[nawazkh]

@AndreiBarbuOz , could you please add more context on pinning the controller-runtime to an older version ?
I am guessing you meant pinning controller-runtime in CAPZ to an older version.
But with the way we have been consuming CAPI (which inherently upgrades controller-runtime for CAPZ) we might be upgrading controller-runtime as and when we consume new version of CAPI.
With #5517 landing soon in CAPZ (aiming to land by May 25th, before this Milestone ends), we will be updating controller-runtime in CAPZ to v0.20.4.

Could an earlier version of CAPZ serve your purpose ?

[AndreiBarbuOz]

CAPZ imports this version:

cluster-api-provider-azure/go.mod

Line 61 in 46be8d1

sigs.k8s.io/controller-runtime v0.19.6

as we import both CAPZ and controller runtime packages, we need to pin the version of the latter in order to build

[nojnhuh]

controller-runtime has been bumped to v0.20.4 in #5517

/close

[k8s-ci-robot]

@nojnhuh: Closing this issue.

In response to this:

controller-runtime has been bumped to v0.20.4 in #5517

/close

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