Bumped spellcheck GHA from 0.17.0 to 0.27.0 (current version)

[jonasbn]

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This pull request updates to the most recent release version 0.27.0 of the spellcheck GitHub action, I can see that you are using 0.17.0, so an update could be useful to you. Let me know if you have any issues with the proposal and I will try to accommodate.

I have defined a sunset policy for the action and the version you are using are soon to be a year old, so it will eventually be deleted from DockerHub.

I can recommend Dependabot or Renovate for keeping your GitHub actions up to date automatically, if you want a PR proposing a basic configuration, please let me know.