SwiftLint fixes. (#2899)

non_optional_string_data_conversion and static_over_final_class

* Revert Data -> String changes for upcoming rule change.

ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -3,7 +3,7 @@
     {
       "identity" : "compound-design-tokens",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/element-hq/compound-design-tokens.git",
+      "location" : "https://github.com/element-hq/compound-design-tokens",
       "state" : {
         "revision" : "c3fff1f2b042295cd5f4bcf8d4fe68ec47ca4061",
         "version" : "1.2.0"
@@ -191,7 +191,7 @@
     {
       "identity" : "sfsafesymbols",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/SFSafeSymbols/SFSafeSymbols.git",
+      "location" : "https://github.com/SFSafeSymbols/SFSafeSymbols",
       "state" : {
         "revision" : "7cca2d60925876b5953a2cf7341cd80fbeac983c",
         "version" : "4.1.1"