fix: update conversion-gen input params

[joekr]

Couldn't find change log, but here is the current supported args list https://github.com/dinhxuanvu/kubernetes/blob/917aa9a8c4658a5cf870ab7e629a73534e3a1808/staging/src/k8s.io/code-generator/cmd/conversion-gen/args/args.go#L35-L63

What this PR does / why we need it:
Moving from v1.28.x to v1.31.x changed some of the inputs for the conversion-gen tool. This PR updates the conversion-gen args.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #453

[joekr]

Testing

using the new conversion-gen v0.31.0:

• make generate is passing
• make build is passing
• make test is pasing

        github.com/oracle/cluster-api-provider-oci              coverage: 0.0% of statements
ok      github.com/oracle/cluster-api-provider-oci/api/v1beta1  25.028s coverage: 23.3% of statements
ok      github.com/oracle/cluster-api-provider-oci/api/v1beta2  0.895s  coverage: 14.8% of statements
        github.com/oracle/cluster-api-provider-oci/cloud/config         coverage: 0.0% of statements
        github.com/oracle/cluster-api-provider-oci/cloud/metrics                coverage: 0.0% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/ociutil        1.445s  coverage: 15.9% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/ociutil/ptr    1.360s  coverage: 100.0% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/scope  21.498s coverage: 74.4% of statements
        github.com/oracle/cluster-api-provider-oci/cloud/scope/mocks            coverage: 0.0% of statements
        github.com/oracle/cluster-api-provider-oci/cloud/services/base          coverage: 0.0% of statements
        github.com/oracle/cluster-api-provider-oci/cloud/services/base/mock_base                coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/compute       [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/compute/mock_compute          coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/computemanagement     [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/computemanagement/mock_computemanagement              coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine       [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine/mock_containerengine          coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/identity      [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/identity/mock_identity                coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/loadbalancer  [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/loadbalancer/mock_lb          coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/networkloadbalancer   [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/networkloadbalancer/mock_nlb          coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/vcn   [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/vcn/mock_vcn          coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/cloud/services/workrequests  [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/workrequests/mock_workrequests                coverage: 0.0% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/util   1.220s  coverage: 60.5% of statements
ok      github.com/oracle/cluster-api-provider-oci/controllers  3.411s  coverage: 59.2% of statements
ok      github.com/oracle/cluster-api-provider-oci/exp/api/v1beta1      7.607s  coverage: 15.3% of statements
ok      github.com/oracle/cluster-api-provider-oci/exp/api/v1beta2      1.446s  coverage: 5.8% of statements
ok      github.com/oracle/cluster-api-provider-oci/exp/controllers      1.946s  coverage: 56.3% of statements
        github.com/oracle/cluster-api-provider-oci/feature              coverage: 0.0% of statements
?       github.com/oracle/cluster-api-provider-oci/version      [no test files]