docs: Remove TODO comment

See https://github.com/getsentry/sentry-cli/pull/3088/changes/BASE..74b27e4a029ffb62448264673a64c70d5b1b1b55#r2758772623

Author: szokeasaurusrex

lib/releases/index.ts

@@ -120,7 +120,6 @@ export class Releases {
    * @param options Options to configure the source map upload.
    * @returns A promise that resolves when the upload has completed successfully.
    */
-  // TODO: Add `uploadSourceMaps()` to SourceMaps class as `.upload()` (keep it here too for backward compatibility)
   async uploadSourceMaps(
     release: string,
     options: SentryCliUploadSourceMapsOptions