fix: typescript types (#4393)

lib/platform/azure/index.ts

lib/platform/bitbucket/index.ts

lib/platform/git/storage.ts

lib/workers/branch/get-updated.js

lib/workers/branch/schedule.js

lib/workers/global/index.js

lib/workers/pr/changelog/source-github.js

lib/workers/repository/finalise/validate.js

lib/workers/repository/init/config.js

lib/workers/repository/init/index.js

lib/workers/repository/onboarding/branch/check.js

lib/workers/repository/onboarding/branch/config.js

lib/workers/repository/process/lookup/filter.js

lib/workers/repository/process/write.js

test/types/jest.d.ts

test/website-docs.spec.js