test(parity): add pinned Python manifest checks - #51

Unexpected input(s) 'scopePattern', 'scopePatternError', valid inputs are ['types', 'scopes', 'requireScope', 'disallowScopes', 'subjectPattern', 'subjectPatternError', 'validateSingleCommit', 'validateSingleCommitMatchesPrTitle', 'githubBaseUrl', 'ignoreLabels', 'headerPattern', 'headerPatternCorrespondence', 'wip']