build(deps): update dependency @sindresorhus/is to v0.12.0 (#2570)

lib/config/migrate-validate.js

lib/datasource/docker.js

lib/datasource/pypi.js

lib/workers/branch/commit.js

lib/workers/pr/pr-body.js

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

lib/workers/repository/onboarding/pr/index.js

lib/workers/repository/updates/flatten.js

package.json

yarn.lock