Update build.yml

Bump 5.5 development snapshot to 7/3.

Author: compnerd

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
             tag: 5.4.2-RELEASE
 
           - branch: swift-5.5-branch
-            tag: 5.5-DEVELOPMENT-SNAPSHOT-2021-06-14-a
+            tag: 5.5-DEVELOPMENT-SNAPSHOT-2021-07-03-a
 
           - branch: development
             tag: DEVELOPMENT-SNAPSHOT-2021-06-12-a