Bump Cert-manager version in installation documentation

[github-actions]

Bump Cert-manager version in installation documentation

docs: update cert-manager referenced version v1.18.2

2 file(s) updated with "https://github.com/cert-manager/cert-manager/releases/download/v1.18.2/": * docs/installation/other_inst_scenarios/install_epinio_on_rancher_desktop.md * docs/tutorials/single-dev-workflow.md

v1.18.2

cert-manager is the easiest way to automatically manage certificates in Kubernetes and OpenShift clusters.

We fixed a bug in the CSR's name constraints construction (only applies if you have enabled the `NameConstraints` feature gate).
We dropped the new `global.rbac.disableHTTPChallengesRole` Helm option due to a bug we found, this feature will be released in `v1.19` instead.

Changes since `v1.18.1`:

### Bug or Regression

- BUGFIX: permitted URI domains were incorrectly used to set the excluded URI domains in the CSR's name constraints (#7833, @cert-manager-bot)
- Reverted adding the `global.rbac.disableHTTPChallengesRole` Helm option. (#7837, @cert-manager-bot)

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[dcharles525]

LGTM