Gatekeeper-CRD chart apiVersion is still v1. Need to update it to v2

[rayandas]

Currently rancher-gatekeeper-crd chart apiversion is v1 (https://github.com/rancher/charts/blob/a8dda01c8c939286f30a0539f00acf83be21663b/charts/rancher-gatekeeper-crd/102.1.0%2Bup3.12.0/Chart.yaml#L6).

It needs to be updated to v2 in order to add Hull tests for it. Else Hull tests will fail showing the below error.

    --- FAIL: TestChart/Set_.Values.global.cattle.systemDefaultRegistry (0.03s)
        --- FAIL: TestChart/Set_.Values.global.cattle.systemDefaultRegistry/HelmLint (0.02s)
            template.go:171: [INFO] Chart.yaml: icon is recommended
            template.go:192: 1 error occurred:
                        * [ERROR] Chart.yaml: chart type is not valid in apiVersion 'v1'. It is valid in apiVersion 'v2'

The PR for gatekeeper-crd Hull test: rancher/charts#2625

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