Update formatter

Motivation:

We need to use a newer version of SwiftFormat on the async/await code.
First we should update main so that merging changes into the async
branch is cleaner.

Modifications:

- Update SwiftFormat
- Reformat

Result:

Our version of SwiftFormat is new enough to correctly handle async/await
code.

scripts/format.sh

@@ -21,8 +21,8 @@ REPO="$HERE/.."
 SWIFTFORMAT_DIR="$HERE/.swiftformat-source"
 
 # Important: if this is changed then make sure to update the version
-# in .travis-install.sh as well!
-SWIFTFORMAT_VERSION=0.46.3
+# in the .github/workflows/ci.yaml as well!
+SWIFTFORMAT_VERSION=0.49.4
 
 # Clone SwiftFormat if we don't already have it.
 if [ ! -d "$SWIFTFORMAT_DIR" ]; then