fix(infra-apps): Update cert-manager from 1.15.0 to 1.15.1

[hairmare]

Description

Some moderate security bumps and a bugfix in cert-manager 1.15.1.

Issues

Checklist

• [x] This PR contains a description of the changes I'm making
• [x] I updated the version in Chart.yaml
• [x] I updated the changelog with an artifacthub.io/changes annotation in Chart.yaml, check the example in the documentation.
• [x] I updated applicable README.md files using pre-commit run
• [x] I documented any high-level concepts I'm introducing in docs/
• [x] CI is currently green and this is ready for review
• [x] I am ready to test changes after they are applied and released