test: fix http mocks (#11191)

lib/datasource/clojure/index.spec.ts

lib/datasource/crate/index.spec.ts

lib/datasource/helm/index.spec.ts

lib/datasource/packagist/index.spec.ts

lib/datasource/pod/index.spec.ts

lib/datasource/rubygems/index.spec.ts

lib/manager/bazel/update.spec.ts

lib/platform/bitbucket/index.spec.ts

lib/platform/gitlab/index.spec.ts

lib/util/merge-confidence/index.spec.ts

lib/workers/pr/changelog/github.spec.ts

lib/workers/pr/changelog/gitlab.spec.ts

lib/workers/pr/changelog/index.spec.ts

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

test/http-mock.ts