refactor(util): Fix lint warnings (#7114)

lib/util/cache/memory/index.ts

lib/util/cache/package/index.ts

lib/util/exec/docker/index.ts

lib/util/exec/index.ts

lib/util/fs/index.ts

lib/util/fs/proxies.ts

lib/util/http/github.ts

lib/util/http/index.ts

lib/util/package-rules.ts

lib/util/regex.ts

lib/util/template/index.ts