chainlink-testing-framework Bump tools to be compatible with latest grafana charts

Below is a summarization created by an LLM (gpt-4-0125-preview). Be mindful of hallucinations and verify accuracy.

Why

The changes made in the .tool-versions, Makefile, KUBERNETES.md, and k3d.yaml files are focused on updating dependencies and tooling versions, improving the documentation for monitoring setup, and ensuring compatibility with newer versions of tools and libraries. These updates are crucial for maintaining the software's reliability and performance, as well as providing clear instructions for monitoring installations.

What

.tool-versions:
- Updated k3d from 5.5.1 to 5.6.3.
- Updated helm from 3.13.1 to 3.15.2.
  These changes ensure compatibility with the latest versions of these tools, offering new features and bug fixes.
Makefile:
- Added --version 2.10.2 to the helm command for installing loki.
  This specifies the version of loki to use, ensuring consistency across environments and avoiding potential issues with latest versions.
k8s/KUBERNETES.md:
- Added a note to the make install_monitoring command, clarifying that the command actively connects to the server and providing guidance on proceeding with the setup.
  This improvement in documentation makes the installation process clearer, especially for new users or contributors.
k8s/k3d.yaml:
- Updated the apiVersion from k3d.io/v1alpha4 to k3d.io/v1alpha5.
  This update ensures compatibility with the latest version of k3d, taking advantage of new features and improvements.