ci: fix failing lint-test job

[jpadilla]

Description

• Add dependabot config for github actions
• Bump version for helm/chart-test

Run helm/[email protected]
  with:
    version: v3.8.0
    yamllint_version: [1](https://github.com/openfga/helm-charts/pull/72/checks#step:5:1).[2](https://github.com/openfga/helm-charts/pull/72/checks#step:5:2)7.1
    yamale_version: [3](https://github.com/openfga/helm-charts/pull/72/checks#step:5:3).0.[4](https://github.com/openfga/helm-charts/pull/72/checks#step:5:4)
  env:
    pythonLocation: /opt/hostedtoolcache/Python/3.9.18/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.9.18/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.9.18/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.9.18/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.9.18/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.9.18/x64/lib
Run sigstore/cosign-installer@c3667d99424e7e6047999fb6246c0da8439[5](https://github.com/openfga/helm-charts/pull/72/checks#step:5:5)3c[6](https://github.com/openfga/helm-charts/pull/72/checks#step:5:6)5
Run #!/bin/bash
INFO: Downloading bootstrap version 'v2.0.0' of cosign to verify version to be installed...
      https://storage.googleapis.com/cosign-releases/v2.0.0/cosign-linux-amd64
ERROR: Unable to validate cosign version: 'v2.0.0'
Error: Process completed with exit code 1.

References

https://github.com/helm/chart-testing-action/releases/tag/v2.6.0

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected