Not existing tokens should return 200 within introspection (not 403)

[ZuSe]

Compare with https://datatracker.ietf.org/doc/html/rfc7662

Fixes #

Description of the Change

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[auvipy]

you need to update the tests as well

[n2ygk]

Thanks for this. It looks right but needs the tests fixed. Also, you indicated that CHANGELOG was updated, AUTHORS, etc. but I don't see where you've done that.

The tests looks pretty easy to fix:

 E AssertionError: 200 != 401 

Please let me know if you can get to this soon as I'm targeting this for the next minor release.

[n2ygk]

I've updated the checklist to indicate correct status of this PR.

I made the requested changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.67%. Comparing base (c42423c) to head (19423dc).
Report is 217 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #1012 +/- ## ======================================= Coverage 96.67% 96.67% ======================================= Files 31 31 Lines 1775 1775 ======================================= Hits 1716 1716 Misses 59 59 

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