Replace 5.0.2 with 5.0.3 and remove 4.x versions

Author: gee4vee

manifest.yml

@@ -32,15 +32,9 @@ dependencies:
     cf_stacks:
       - cflinuxfs3
   - name: swift
-    version: 5.0.2
-    uri: https://swift.org/builds/swift-5.0.2-release/ubuntu1804/swift-5.0.2-RELEASE/swift-5.0.2-RELEASE-ubuntu18.04.tar.gz
-    sha256: 95c250699b0ddc1c16c5c18f833b5ca660ac651c5218773b2ff7c6f9157c94fb
-    cf_stacks:
-      - cflinuxfs3
-  - name: swift
-    version: 4.2.4
-    uri: https://swift.org/builds/swift-4.2.4-release/ubuntu1804/swift-4.2.4-RELEASE/swift-4.2.4-RELEASE-ubuntu18.04.tar.gz
-    sha256: 2c48ad9a71dd74189d4338c059cc047ea60d4cecd388126e14b3112a0cca1aa0
+    version: 5.0.3
+    uri: https://swift.org/builds/swift-5.0.3-release/ubuntu1804/swift-5.0.3-RELEASE/swift-5.0.3-RELEASE-ubuntu18.04.tar.gz
+    sha256: 5f10aae8ee9131712828b6683a84e8c39192befba25ab4886bf2b44f15181ce3
     cf_stacks:
       - cflinuxfs3
   - name: clang