[chore] Update spec version using renovate

[thompson-tomo]

Changes

This replaces the shell script and workflow which mantains spec version with a renovate manager

Important

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PRs that do not follow the guidance above, may be automatically rejected and closed.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• Links to the prototypes or existing instrumentations (when adding or changing conventions)

[trask]

@thompson-tomo have you tested it on your fork? just know from experience it's hard (for me) to get these custom rules right, thanks

[thompson-tomo]

@trask you are right it is hard to test them end to end. What I have been able to test using the renovate cli is:

• are the references (dependencies) being detected
• is it finding updates when it should be including resolving to the right version. To do so I tested using a commit prior to the recent changes
• when the docs have been updated do the needed updates decrease.

What I have not tested is what the contents of a pr looks like when raised by renovate.

[github-actions]

This PR has been labeled as stale due to lack of activity. It will be automatically closed if there is no further activity over the next 7 days.