[CI] disable 1.11 nightly testing

[kschoche]

Changes proposed in this PR:

• release/0.49.0 was released with CRDs which are backward incompatible with Consul 1.11 which will be EOL soon, disable the 1-11 nightlies.
  This should make the nightlies go 🍏

How I've tested this PR:
Validated that 0.49.x still works with consul 1.12+1.13 and that consul-1.11 does not have this config entry.

CI pipelines fail due to invalid CRDs:

2022-10-12T15:46:00.512Z        ERROR   controller.servicedefaults      Reconciler error        {"reconciler group": "consul.hashicorp.com", "reconciler kind": "ServiceDefaults", "name": "defaults", "namespace": "ns1", "error": "writing config entry to consul: Unexpected response code: 400 (Bad request: Request decoding failed: 1 error occurred:\n\t* invalid config key \"UpstreamConfig.Overrides[0].PassiveHealthCheck.EnforcingConsecutive5xx\")"}
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        /home/runner/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.10.2/pkg/internal/controller/controller.go:266
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
        /home/runner/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.10.2/pkg/internal/controller/controller.go:227
^C
demo $ grep -R EnforcingConsecutive5xx ./
.//CHANGELOG.md:  * New parameter `EnforcingConsecutive5xx` which supports a configurable percent chance of automatic ejection of a host when a consecutive number of 5xx response codes are received [[GH-1484](https://github.com/hashicorp/consul-k8s/pull/1484)]

How I expect reviewers to test this PR:
👀

Checklist:

• Tests added
• CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry.
  Entries should use present tense (e.g. Add support for...)

[jmurret]

🎉 🙏

[curtbushko]

👏