Update build.yml

Bump the 5.5 builds to 5.5.3

Author: compnerd

.github/workflows/build.yml

@@ -19,8 +19,8 @@ jobs:
           - branch: swift-5.4.3-release
             tag: 5.4.3-RELEASE
 
-          - branch: swift-5.5-release
-            tag: 5.5-RELEASE
+          - branch: swift-5.5.3-release
+            tag: 5.5.3-RELEASE
 
           - branch: swift-5.6-branch
             tag: 5.6-DEVELOPMENT-SNAPSHOT-2022-02-07-a