Update the CAPI version in the e2e_conf.yaml

[joekr]

What this PR does / why we need it:
bumped to 1.3.0 release

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
no open issue

[joekr]

e2e test

Summarizing 1 Failure:

[Fail] Workload cluster creation [It] Default CNI - with 1 control-plane nodes and 1 worker nodes [PRBlocking]
/home/ubuntu/go/pkg/mod/sigs.k8s.io/cluster-api/test@v1.2.0/framework/clusterctl/clusterctl_helpers.go:313

Ran 5 of 22 Specs in 1794.563 seconds
FAIL! -- 4 Passed | 1 Failed | 0 Pending | 17 Skipped

reran test `GINKGO_FOCUS="Default CNI - with 1 control-plane nodes and 1 worker nodes" scripts/ci-e2e.sh`

Ran 1 of 22 Specs in 783.953 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 21 Skipped

[randomvariable]

lgtm