feat: bump CAPI to 1.8.1

[joekr]

What this PR does / why we need it: Updates CAPI to 1.8.1 from 1.7.0

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 #371

[joekr]

e2e tests

Ran 7 of 28 Specs in 3379.842 seconds
SUCCESS! -- 7 Passed | 0 Failed | 0 Pending | 21 Skipped

unit tests

        github.com/oracle/cluster-api-provider-oci              coverage: 0.0% 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
?       github.com/oracle/cluster-api-provider-oci/cloud/services/compute       [no test files]
        github.com/oracle/cluster-api-provider-oci/cloud/services/base          coverage: 0.0% of statements
        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/scope/mocks            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/computemanagement     [no test files]
?       github.com/oracle/cluster-api-provider-oci/cloud/services/containerengine       [no test files]
?       github.com/oracle/cluster-api-provider-oci/cloud/services/identity      [no test files]
?       github.com/oracle/cluster-api-provider-oci/cloud/services/loadbalancer  [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/identity/mock_identity                coverage: 0.0% of statements
        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/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/vcn   [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/mock_vcn          coverage: 0.0% 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]
ok      github.com/oracle/cluster-api-provider-oci/api/v1beta1  49.544s coverage: 23.4% of statements
ok      github.com/oracle/cluster-api-provider-oci/api/v1beta2  2.328s  coverage: 14.7% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/ociutil        2.573s  coverage: 19.6% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/scope  241.300s        coverage: 75.8% of statements
ok      github.com/oracle/cluster-api-provider-oci/cloud/util   2.438s  coverage: 45.1% of statements
ok      github.com/oracle/cluster-api-provider-oci/controllers  29.535s coverage: 42.3% of statements
ok      github.com/oracle/cluster-api-provider-oci/exp/api/v1beta1      18.212s coverage: 15.3% of statements
ok      github.com/oracle/cluster-api-provider-oci/exp/api/v1beta2      3.152s  coverage: 4.8% of statements
ok      github.com/oracle/cluster-api-provider-oci/exp/controllers      5.348s  coverage: 51.8% of statements

[joekr]

This is now done as part of https://github.com/oracle/cluster-api-provider-oci/pull/448. Closing this PR.