refactor: fix `prefer-nullish-coalescing` (#16171)

.eslintrc.js

lib/config/massage.ts

lib/config/migrate-validate.ts

lib/config/presets/index.ts

lib/modules/datasource/conan/index.ts

lib/modules/datasource/git-tags/index.ts

lib/modules/datasource/go/releases-goproxy.ts

lib/modules/datasource/npm/get.ts

lib/modules/datasource/pypi/index.ts

lib/modules/manager/bazel/extract.ts

lib/modules/manager/bazel/update.ts

lib/modules/manager/bundler/extract.ts

lib/modules/manager/composer/artifacts.ts

lib/modules/manager/docker-compose/extract.ts

lib/modules/manager/gradle/extract/catalog.ts

lib/modules/manager/leiningen/extract.ts

lib/modules/manager/mix/extract.ts

lib/modules/manager/nuget/artifacts.ts

lib/modules/manager/poetry/update-locked.ts

lib/modules/manager/regex/strategies.ts