chore: lint fixes (#7018)

.eslintrc.js

lib/manager/gradle/__testutil__/gradle.ts

lib/manager/npm/extract/common.ts

lib/platform/azure/azure-helper.ts

lib/platform/azure/index.ts

lib/platform/bitbucket-server/index.ts

lib/platform/bitbucket/index.ts

lib/platform/gitea/index.ts

lib/platform/github/index.ts

lib/platform/github/types.ts

lib/platform/gitlab/index.ts

lib/platform/gitlab/types.ts

lib/types/git.ts

lib/util/git/index.ts

lib/workers/common.ts

lib/workers/repository/updates/branchify.ts

test/httpMock.ts

test/newline-snapshot-serializer.ts

test/util.ts

test/website-docs.spec.ts