fix(snapshots): Await send() before calling error_for_failures

The objectstore-client 0.1.6 upgrade changed send() to return a
Future, so it needs to be awaited before calling error_for_failures().
Also add changelog entry for the PR.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lcian

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Features
+
+- (snapshots) Support dedicated objectstore auth token ([#3258](https://github.com/getsentry/sentry-cli/pull/3258))
+
 ### Fixes
 
 - Replace `eprintln!` with `log::info!` for progress bar completion messages when the progress bar is disabled (e.g. in CI). This avoids spurious stderr output that some CI systems treat as errors ([#3223](https://github.com/getsentry/sentry-cli/pull/3223)).

src/commands/build/snapshots.rs

@@ -410,7 +410,7 @@ fn upload_images(
         warn!("Some images share identical file names. Only the first occurrence of each is included:{details}");
     }
 
-    let result = runtime.block_on(async { many_builder.send().error_for_failures().await });
+    let result = runtime.block_on(async { many_builder.send().await.error_for_failures().await });
 
     let uploaded_count = manifest_entries.len();