chore(deps): update dependency cert-manager/cert-manager to v1.20.1 (#5206)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [cert-manager/cert-manager](https://github.com/cert-manager/cert-manager) | patch | `v1.20.0` → `v1.20.1` |

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### Release Notes

<details>
<summary>cert-manager/cert-manager (cert-manager/cert-manager)</summary>

### [`v1.20.1`](https://github.com/cert-manager/cert-manager/releases/tag/v1.20.1)

[Compare Source](https://github.com/cert-manager/cert-manager/compare/v1.20.0...v1.20.1)

v1.20.1 fixes an issue for OpenShift users that has to do with the finalizer RBAC, bumps gRPC to address a reported non-affecting vulnerability, and fixes a duplicate `parentRef` bug when both issuer config and annotations are present (Gateway API).

##### Bug or Regression

- Fixed duplicate `parentRef` bug when both issuer config and annotations are present. ([#&#8203;8658](https://github.com/cert-manager/cert-manager/issues/8658), [@&#8203;hjoshi123](https://github.com/hjoshi123))
- Add missing issuer finalizer RBAC to the order controller to support owner references. This was preventing OpenShift users from being able to upgrade to v1.20.0. ([#&#8203;8655](https://github.com/cert-manager/cert-manager/issues/8655), [@&#8203;erikgb](https://github.com/erikgb))
- Bump google.golang.org/grpc to fix vulnerability reported by scanners. This isn't a vulnerability that affects cert-manager, but we are bumping it because it is reported by scanners. ([#&#8203;8657](https://github.com/cert-manager/cert-manager/issues/8657), [@&#8203;erikgb](https://github.com/erikgb))

</details>

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Reviewed-on: https://gitea.alexlebens.dev/alexlebens/infrastructure/pulls/5206
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/cert-manager/Chart.yaml

@@ -17,4 +17,4 @@ dependencies:
     repository: https://charts.jetstack.io
 icon: https://raw.githubusercontent.com/cert-manager/cert-manager/refs/heads/master/logo/logo.png
 # renovate: datasource=github-releases depName=cert-manager/cert-manager
-appVersion: v1.20.0
+appVersion: v1.20.1