Upgrading the version of controller-gen used by k6-operator

[bm1216]

Feature Description

TO-DO

Update the version of controller-gen supported by k6-operator.

WHY?

k6-operator is currently supporting v0.3.0 of the controller-gen cli while v0.13.0 has been released.
https://github.com/kubernetes-sigs/controller-tools/releases/tag/v0.13.0

Currently, k6-operator doesn't work with version v0.7.0 and above of controller-gen. This is due to addition of the trivialVersions option here -

k6-operator/Makefile

Line 21 in e6001f2

CRD_OPTIONS ?= "crd:trivialVersions=true,crdVersions=v1,maxDescLen=0"

which has been removed here in controller-gen -
kubernetes-sigs/controller-tools@09f1952#diff-fa737e39d27a85a80d2b211933392436e0e10b850c68cb53e3e8873b83d82071L42-L61

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