deps(deps): update module sigs.k8s.io/cluster-api to v1.8.1 (#467)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[sigs.k8s.io/cluster-api](https://togithub.com/kubernetes-sigs/cluster-api)
| `v1.8.0` -> `v1.8.1` |
[![age](https://developer.mend.io/api/mc/badges/age/go/sigs.k8s.io%2fcluster-api/v1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/go/sigs.k8s.io%2fcluster-api/v1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/go/sigs.k8s.io%2fcluster-api/v1.8.0/v1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/sigs.k8s.io%2fcluster-api/v1.8.0/v1.8.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>kubernetes-sigs/cluster-api (sigs.k8s.io/cluster-api)</summary>

###
[`v1.8.1`](https://togithub.com/kubernetes-sigs/cluster-api/compare/v1.8.0...v1.8.1)

[Compare
Source](https://togithub.com/kubernetes-sigs/cluster-api/compare/v1.8.0...v1.8.1)

</details>

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go.mod

@@ -23,7 +23,7 @@ require (
 	k8s.io/api v0.30.3
 	k8s.io/apimachinery v0.30.3
 	k8s.io/client-go v0.30.3
-	sigs.k8s.io/cluster-api v1.8.0
+	sigs.k8s.io/cluster-api v1.8.1
 	sigs.k8s.io/controller-runtime v0.18.5
 )
 

go.sum

@@ -318,8 +318,8 @@ k8s.io/utils v0.0.0-20240502163921-fe8a2dddb1d0 h1:jgGTlFYnhF1PM1Ax/lAlxUPE+KfCI
 k8s.io/utils v0.0.0-20240502163921-fe8a2dddb1d0/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.30.0 h1:Tc9rS7JJoZ9sl3OpL4842oIk6lH7gWBb0JOmJ0ute7M=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.30.0/go.mod h1:1ewhL9l1gkPcU/IU/6rFYfikf+7Y5imWv7ARVbBOzNs=
-sigs.k8s.io/cluster-api v1.8.0 h1:xdF9svGCbezxOn9Y6QmlVnNaZ0n9QkRJpNuKJkeorUw=
-sigs.k8s.io/cluster-api v1.8.0/go.mod h1:iSUcU8rHBNRa6wZJvU6klHKI3EVQC0aMcgjeSofBwKw=
+sigs.k8s.io/cluster-api v1.8.1 h1:OA3w1CjCmXXXDL7aY3WDe+seL0mdFVJX1K5mZwqKbDE=
+sigs.k8s.io/cluster-api v1.8.1/go.mod h1:pXv5LqLxuIbhGIXykyNKiJh+KrLweSBajVHHitPLyoY=
 sigs.k8s.io/controller-runtime v0.18.5 h1:nTHio/W+Q4aBlQMgbnC5hZb4IjIidyrizMai9P6n4Rk=
 sigs.k8s.io/controller-runtime v0.18.5/go.mod h1:TVoGrfdpbA9VRFaRnKgk9P5/atA0pMwq+f+msb9M8Sg=
 sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=