Schema: Batch of small fixes (#9492)

* Fix AllUnitList schema operation and serializer to match actual response

* Fix LicenseViewSerializer to match actual response

* Remove references to credits page (removed in #8811)

* Allow null commit_branch for detatched HEAD state

* Fix version formatting, add test, clean up parser

* Fix schema mapping and return type for VersionTextView

* Fix and test version off-by-one bug

* API version bump

* Merge version tests, enforce more formatting constraints for parsing

src/frontend/src/components/modals/AboutInvenTreeModal.tsx

@@ -162,7 +162,6 @@ export function AboutInvenTreeModal({
             [
               { ref: 'doc', title: <Trans>Documentation</Trans> },
               { ref: 'code', title: <Trans>Source Code</Trans> },
-              { ref: 'credit', title: <Trans>Credits</Trans> },
               { ref: 'app', title: <Trans>Mobile App</Trans> },
               { ref: 'bug', title: <Trans>Submit Bug Report</Trans> }
             ],