fix(internal): fix linting (#6803)

.eslintrc.js

lib/config/presets/github/index.ts

lib/config/presets/gitlab/index.ts

lib/config/presets/local/index.spec.ts

lib/config/presets/local/index.ts

lib/datasource/index.ts

lib/datasource/packagist/index.ts

lib/datasource/rubygems/releases.ts

lib/manager/gradle-wrapper/artifacts.ts

lib/platform/bitbucket-server/utils.ts

lib/platform/bitbucket/utils.ts

lib/util/fs/proxies.ts

lib/util/git/index.ts

lib/util/http/bitbucket-server.ts

lib/util/http/bitbucket.ts

lib/util/http/index.ts

lib/workers/branch/commit.ts

lib/workers/pr/changelog/release-notes.ts

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

lib/workers/pr/changelog/source-gitlab.ts